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Mathematics 19 Online
OpenStudy (theedwardsfamily):

Check my answers? Thanks! :) http://prntscr.com/9mt7z7

OpenStudy (igreen):

I believe you made mistakes when calculating the y-intercept for the first equation.

OpenStudy (igreen):

The slope is correct, but the y-intercept is not.

OpenStudy (theedwardsfamily):

okay

OpenStudy (igreen):

We can plug in one point given and the slope into point-slope form to find the equation. \(\sf y - y_1 = m(x - x_1)\) (-3, 7), slope = -2 \(\sf y - 7 = -2(x - (-3))\) Can you simplify that equation?

OpenStudy (theedwardsfamily):

Yes. one sec

OpenStudy (igreen):

Your second equation is correct.

OpenStudy (igreen):

The table already gives you the y-intercept. (0, 5) \(\sf y = -2x + 5\)

OpenStudy (theedwardsfamily):

i see

OpenStudy (igreen):

Did you simplify the equation?

OpenStudy (theedwardsfamily):

i got y=13x

OpenStudy (igreen):

No.. \(\sf y - 7 = -2(x - (-3))\) \(\sf y - 7 = -2(x + 3)\) Distribute -2 into the parenthesis, can you do that?

OpenStudy (theedwardsfamily):

ohhh yes, i can

OpenStudy (theedwardsfamily):

that would be 5x, right?

OpenStudy (theedwardsfamily):

-5

OpenStudy (igreen):

No, how did you get that?

OpenStudy (igreen):

Distributing multiplies the number on the outside of the parenthesis to every term inside the parenthesis.|dw:1452097659135:dw|

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