exam Maths Puzzle Numerical Ability

I am having difficulty with this equation.
Find the inverse of the function,

f(x) = (3 + 2x)/(2-5x)

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exam Other Question

Can someone help me on this problem?

On this problem, in case you have the book above, they have graphed the boundary line for the linear inequality. I need to determine the Solve the system by substitution:
4x - 12y = 5
-x + 3y = -1

Thanks for any help you can give me.