book Maths Puzzle Numerical Ability

I need to graph the following two equations but am having trouble finding the solutions first.

x-2y-8

and

3x-2y=12

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book Other Question

x^2 + 2x - 15 = 0 the height h, of a ball above ground t seconds after it is thrown vertically upwards can be approximated by the formula h=vt-5t squared, where v is the intial speed with which the