book Maths Puzzle Numerical Ability

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!!

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book Other Question

Please help me determine which two equations represent parallel lines
y = -4x + 4
y = 4x + 4
y = 1/4x + 4
y = -4x + 5

Thank you 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