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NationalTutoringObservatory
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MathEd-PII

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volunteer
So, that's really close but it's not exactly right. We know that point slope form is y=mx + b. So we have to isolate the y by subtracting the 2xs from both sides.
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volunteer
What does that give us?
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volunteer
I'm going to put the steps on the whiteboard as well so you can visualize it.
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student
7y=14-2x
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volunteer
Exactly! Do you know what to do next?
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student
divide ll by 7
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volunteer
you got it!
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volunteer
so what does y equal to?
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student
y=2-2/7x
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volunteer
perfect! So now you have it in point slope form. Do you remember what exactly the x-intercept means?
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student
where the "first" point meets the x axis
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volunteer
Yup! The x-intercept is where the line crosses the x-axis. At that point, y = 0. So, if we know that, do you have an idea on how to solve for the x-intercept?
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student
I guess insert zero into the equation?
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volunteer
yup! What would you substitute 0 for?
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student
y
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volunteer
you got it!
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volunteer
do you want to solve it or do you want to solve it together>
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student
I'll solve
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volunteer
Great!
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student
correct?
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volunteer
You're super close but I think something went wrong. Let's go over it.
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volunteer
Do you see what I'm writing on the whiteboard?
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student
yes]
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student
Ho'd you get that?
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student
How'd you get that?
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volunteer
Which part?
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student
That whole chunk
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volunteer
Ok, so you divided -2/7 by both sides. Right?
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volunteer
And when you divide a fraction you multiply it's recipricol which you also did.
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volunteer
which in this case is -7/2.
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student
oh i thought we kept the sign, ok
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student
I meant omitted the sign
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volunteer
So, then you do -2 times -7/2. You multiply the numerators (-2 x-7) which gives us a positive number since we're multiplying two negatives (14) and then we do the denominators. A whole number has a denominator of one (-2/1) so it would be 1x2 which is still 2. So, then you get 14/2 which simplifies to 7.
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volunteer
That's alright! You keep the signs in this case.
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volunteer
Does that make sense or would you like me to explain it a bit more?
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student
Oh I have to go now, sorry
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volunteer
That's alright! I hoped this helped! Have a nice day.
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student
Hello!
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volunteer
hello
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student
Can I get some help with subtracting polynomials
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volunteer
it would be a good idea to write it as a subtraction, using parentheses for each expression
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student
ok
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volunteer
do you know what I mean?
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student
I understand like (-4x^2+7x-8)-(10x^2+3x+9)
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volunteer
Be careful. that is not what they are saying
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student
Oh ok, then Im not so sure
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student
I did already make an attempt
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volunteer
what is being subtracted from what?
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student
is (10x^2+3x+9) being subtracted by (-4x^2+7x-8)
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volunteer
I am not quite sure what you are saying. can you write the subtraction on the board.
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volunteer
or in the text, if you can't write on the board
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student
Its ok whiteboard is fine, can you read my writing
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volunteer
Yes, but you changed some of the signs
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student
Hey I'm sorry I have to go but I'll ask my teacher about it
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student
hi
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volunteer
hi
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student
can you help me with a problem please
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volunteer
Of course, can you show or explain it to me?
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student
ok
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student
lemme try to screenshot it
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volunteer
No problem, take your time.
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student
there.
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volunteer
Ok, thank you. Let's start by thinking of the steps to solve this.
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volunteer
In a situation like this, the first step is to make them like numbers. Can you do that for me?
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student
11/4
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student
oh like numbers?
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student
I don't know how to do that
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volunteer
No you are correct
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student
oh
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volunteer
Sorry, that was bad wording on my part
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volunteer
Hi Alex!
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[ { "pii_type": "PERSON", "surrogate": "Alex", "start": 3, "end": 7 } ]
student
Hello!
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volunteer
What would you like help with?
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student
I was wondering if you could make sure i'm doing this right so far
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volunteer
Sure!
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volunteer
Looks good so far! Keep going
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student
Mr. David!
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[ { "pii_type": "PERSON", "surrogate": "Mr. David", "start": 0, "end": 9 } ]
student
can you check my answers
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volunteer
Yes
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volunteer
Looks good! However, the frequencies are a bit off
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student
o
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student
how
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volunteer
The 70.5-75.5 should be 11, while the one after it should be 4
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volunteer
This is because of the boundaries, so one of the numbers doesn't belong
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student
Can u fix the colors then please
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student
icounted 12
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volunteer
Sure!
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student
ty
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volunteer
There you go!
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volunteer
That makes it 11 and 4, there were just 2 numbers misplaced
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student
i dont see a change
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student
oh u recircled
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volunteer
Yes
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student
i mean like can u fix the numbers too in color
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student
so i wont et confusd
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volunteer
Ok!
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volunteer
Is it more clear now?
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student
yes
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volunteer
Ok!
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volunteer
Are there any other questions you need help with?
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