Answer:
y = x-20
Step-by-step explanation:
finding the equation of the line
get 2 points A and B , they are an on the line
make sure its in the form (x,y)
A = (0 , -20)
B = ( 70 , 50)
now get the gradient
gradient = [tex]\frac{y2-y1}{x2-x1}[/tex]
= [tex]\frac{50 - - 20}{70-0}[/tex]
= 70/70
gradient = 1
now make the equation
m is the gradient
y- y1 = m (x-x1)
y- -20 = 1 (x - 0)
y + 20 = x
put in the form y = mx +c
therefore
y = x - 20
