exam Maths Puzzle Numerical Ability

This is system of equations substitution.I need help with
y=2x-4
y=3x

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exam Other Question

Solve. 3(x - 5) + 3x = 4x + 5 Please help me help my daughter with rational expressions.

x+1 over (x+3)(x-3)plus 4(x-3) over (x+3)(x-3)plus (x-1)(x-3) over (3-x)(x+3) =?

Also,

6 over x-y plus 4x over y^2 - x^2 =?