exam Maths Puzzle Numerical Ability

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.

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exam Other Question

Subtract write your answer in simplest form.
2y/y-4 - 3y/+3

Thank you very much.
f(x)=2x-4, find f^-1(x)

This is the hardest one so far.