book Maths Puzzle Numerical Ability

I am not quite sure on how the graph is supposed to look like. My equations are: 2x-y=4
-6x+3y= -18

i tried it but i got y= -4+2x for the first equation and y=6+2x for the

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book Other Question

i need to know the formula for finding a missing side of a right triangel(if two of the sides are already found) please answer as soon as poosibly thank you soo much!! Find two negative numbers such that the square of their sum is 20 more than the square of their difference, and the difference of their squares is 24.

I have an upcoming mathletes compitition, and this problem has me stumpted.