To inverse a function, we do this:
f(x) = (5x - 5)/ 2
Turn f(x) into y
y = (5x - 5)/2
Swap x and y
x = (5y - 5)/2
Solve for y
Multiply 2
2x = 5y - 5 Add 5
2x + 5 = 5y
Divide
(2x + 5)/5 = y
Replace y with f^-1(x)
f^-1(x) = (2x + 5)/5
Your answer is E.
