(-1,10), (2,1) , (0,7), (-2,1)
56 is your answer.
Equation for direct proportion is y = kx where k is the constant of proportionality. For your letters, it’s f = ka
We know 72 =k9, so k = 8
Then they want you to solve
f = 8•7
f = 56

Start with point-slope form, where
is the slope and
is a known point on the line.

Substitute in the known values.

Distribute the
to the
.

Add
to both sides.
