exam Maths Puzzle Numerical Ability

f(x)=2x-4, find f^-1(x)

This is the hardest one so far.

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Please help I am not sure how to do this type of graph

Write the equation of the line with slope 4 and y-intercept (0, -5). Then graph the line. solve
X^4-10x^2+9=0
and
y-2-8(sqrt)(y-2)+15=0

Thanks!