exam Maths Puzzle Numerical Ability

What are the steps to solving a system using substitution. example:

y=x+2 y=2x-1.

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exam Other Question

im stuck on these 2 problems. thanks for your help.

divide and if possible simplify.

problem 1 3y+15/y^7 / y+5/y^2

problem 2 x^2-y^2/4x+4y / 3y-3x/12x^2 Please help to graph on a number line :

x^2 - 5x > or equal to -6; D = {reals}