exam Maths Puzzle Numerical Ability

21 ___ ___63___ ___ I am told that there is a strategy for finding missing numbers on a number line when the numbers are the same distance apart. I am helping my son with his home work and i need your help

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I have to find the slope and y- intercept of the line for these three but i dont get how
4x+2y=32 i tried to work this out here
-4 -4
2y=-4x-32
y-2x=16
the next is 9x+3y=-81
2x-5y=10 please help me with these problems:

what is the square roots of 128 and 80?