Question 160155
First we have to find the slope of the line m=y2-y1/x2-x1=rise/run

-3-1/7-(-2)=-4/9

y=-4/9x+b

plug in the x and y values of one point(-2,1) to determine the value of b the constant.


1=(-4)(-2)/9+b

9/9=8/9+b

Subtract 8/9 from both sides


1/9=b

Let's confirm that it is correct by

plugging in the x,y values of the second point and see if we are correct

y=-4/9x+1/9

(7,-3)

-3=-4(7)/9+1/9

-3=-28/9+1/9

-3=-27/9