Answer:
The equation is: y = 4x - 8
Step-by-step explanation:
Use the point (4, 8) and the slope of 4 with the point slope form:
y - y1 = m(x - x1)
y - 8 = 4(x - 4)
y - 8 = 4x - 16
y = 4x - 8
Proof:
f(4) = 4(4) - 8
= 16 - 8
= 8, giving the point (4, 8)
