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Mathematics 11 Online
OpenStudy (anonymous):

WILL FAN AND MEDAL attaching problem below

OpenStudy (anonymous):

OpenStudy (anonymous):

@iGreen

OpenStudy (igreen):

What's the y-intercept here?

OpenStudy (anonymous):

1

OpenStudy (igreen):

No, almost.

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?

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

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

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