what is the inverse of 7x-11
y = 7x - 11 add 11 to both sides
y + 11 = 7x divide both sides by 7
[ y + 11 ] / 7 = x "swap" x and y
[x + 11 ] / 7 = y for y, write "f-1(x)" {signifying the inverse function}
[x + 11 ] / 7 = f-1(x)