Complete the equation for the linear function whose graph contains the points
(9, 7) and (4, –8).
y − = (x − 9)

Complete the equation for the linear function whose graph contains the point (7, 8) and has a slope of −1.2.
y = x +

will fan and medal

Question

Complete the equation for the linear function whose graph contains the points 
(9, 7) and (4, –8).
y −   =   (x − 9)

Complete the equation for the linear function whose graph contains the point (7, 8) and has a slope of −1.2.
y =   x +  

will fan and medal

igreen · Answer

First, we find the slope.

$m = \dfrac{y_2-y_1}{x_2-x_1}$

$m = \dfrac{-8-7}{4-9}$

Simplify that

anonymous · Answer

$$\frac{ -15 }{ -5} = 3$$

igreen · Answer

Yes, so the slope is 3..

$y - y_1 = m(x - x_1)$

Where y1 is the y-value, 'm' is the slope, and x1 is the x-value.

We are already given the x-value, which is 9. And one of our points has x for 9..(9, 7). So our y-value is 7.

So what should our equation be?

anonymous · Answer

y-7=3(x-9)

igreen · Answer

Yes! You got it

anonymous · Answer

can you also help with the last one? @iGreen

igreen · Answer

Sure, just close this and open a new one.