I hope this helps you
f (x)=4x-x/6
f (x)=23x/6
6.f (x)=23x
x=6.f (x)/23
f^-1 (x)=6.x/23
1. x+5y=8
2x- 5y=1 What you do is find the number/variable that are the same( here is is the +5y and -5y. You want them to be opposites(-,+) so that they cancel each other out. if they are not opposites, then multiply one equation by a negative sign to change it. Cross out the 5y's. Now you can combine like terms-x+2x=3x, and 8+1=9, so now your equation will look like this:
3x=9
x=9/3
x=3
now take x=3 and plug it into the first equation to solve for y. x+5y=8, so 3+5y=8
5y=8-3
5y=5
y=5/5
y=1
(3,1) are your answers.
now do the same with the other problems.
It's the same thing as before, A = BH
Remember A will always be some kind of Total, in this sense. Then you have to figure out what is the constant factor, that will be H then figure out what makes the constant factor vary. In this case it's the number of memberships since that can vary from week to week but her hours can not.
Like how you can vary the number of cans but you can not vary the price that they sell the cans.