Question

If f(x)=5x+4, then the inverse of f will
(a) subtract 4 from its input, then divide by 5
(b) divide its input by 5, then subtract 4
(c) divide its input by 4, then subtract 5
(d) subtract 5 from its input, then divide by 4

Answer 1

First, do you know how to find the inverse function of f?

Answer 2

u take the negative?

Answer 3

no. you write the equation as y = 5x + 4 and then solve this equation for x. can you do that?

Answer 4

x=y-4/5

Answer 5

no.
y = 5x + 4
y - 4 = 5x
\[x=\frac{ y-4 }{ 5 }\]

Answer 6

yeah thats what i typed didnt i?