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OpenStudy (anonymous):
OpenStudy (anonymous):
@iGreen
OpenStudy (igreen):
What's the y-intercept here?
OpenStudy (anonymous):
1
OpenStudy (igreen):
No, almost.
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OpenStudy (igreen):
It's actually going to be negative.
OpenStudy (anonymous):
-1
OpenStudy (anonymous):
@iGreen
OpenStudy (igreen):
Yep, that's right..now we have to find the slope of the line.
OpenStudy (igreen):
We have (-1, 2) and (1, -4).
Plug them in the slope formula:
\(m = \dfrac{y_2-y_1}{x_2-x_1}\)
\(m = \dfrac{-4-2}{1+1}\)
Add & Subtract:
\(m = \dfrac{-8}{2}\)
Can you divide that?
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OpenStudy (anonymous):
-4 right?
OpenStudy (anonymous):
@iGreen
OpenStudy (igreen):
Yep, so the slope is -4, and the y-intercept is -1.
Slope-intercept form:
y = mx + b
Where m = slope and b is y-intercept.
So what's the equation gonna be?
OpenStudy (anonymous):
y=-4x+-1
OpenStudy (igreen):
Yep!
But you don't need the plus sign there:
y = -4x - 1
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OpenStudy (anonymous):
um that's not one of the answers.... @iGreen
OpenStudy (igreen):
Oh, sorry that's -6 / 2..which is -3..so the equation is y = -3x - 1