Question 527948
(x,y) = (-1,3) 
(x<sub>1</sub>, y<sub>1</sub>) = (2,-0.5)

m = (y - y<sub>1</sub>) / (x - x<sub>1</sub>)
.
m = (3-(-0.5)) / (-1-2) = -3.5/3
.
y = -(3.5/3)*x + b
.
Use one of the points to find 'b'.
.
3 = -(3.5/3)*(-1) + b
.
3 = 3.5/3 + b
.
b = 3-3.5/3 = 9/3 - 3.5/3 = 5.5/3
.
y = -3.5/3*x + 5.5/3
.
{{{ graph(500,500,-5,5,-5,5,-3.5/3*x+5.5/3) }}}