exam Maths Puzzle Numerical Ability

what is the x-intercept of y=4

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exam Other Question

Find the inverce of the function f(x)= 2/3x- 3/5.

I know the answer is f^-1 (x) =3/2x + 9/10.

It is really important to me to know how it is done. I need to know the solution. Thanks I need help on a particular problem, number 6 and possibly number 8

on the Chapter 3 Assesstment