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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
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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
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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?
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OpenStudy (igreen):
Distributing multiplies the number on the outside of the parenthesis to every term inside the parenthesis.|dw:1452097659135:dw|