Which expression represents the inverse of y = 12x - 3

y = x + 3 / 12
This is your answer.

Y = 12x - 3
12x - 3 = y
12x = y + 3
x = (y + 3)/12
y⁻¹ = (x + 3)/12

Invers of y is (x+3)/12

Okay i already have it though

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho