What is the function equation for the input/output table? x y
0 0
1.3 3.9
5 15
8 24

y = (3.9) x

y = x + 3

y = 3 x

y = x + 3.9

it's

f is the midpoint of

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18