book Maths Puzzle Numerical Ability

Also the slope of
5x-y=-7

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book Other Question

1x-2y-2z+2w+-24
0x-1y-2z-1w=-12

find X:
Y:
W:
Z:
Write without parentheses: This is one big parentheses that surrounds both top and bottom numbers.
.
(-3a)^4/(b^3)