Answer:
y = -1x + 9
Step-by-step explanation:
y=mx+c
Find the gradient: (m)
gradient = change in y ÷ change in x
so, 3 ÷ -3 = -1
Substitute any coordinate into the equation y= -1x + c
eg. (6,3) (x,y)
x=6 and y=3
3 = -1(6) +c
3= -6 + c
Rearrange to make c the subject
C= 3+6 = 9
so y= -1x +9
