exam Maths Puzzle Numerical Ability

x + 2y - 7z = -1
3x + 7y - 24z = 6
x + 4y - 12z = 26

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exam Other Question

find the slope of the line that passes through the points (-4,1) and (3,8) -8=-(x+4) [ditribute negative into the ()]
-8=-x-4
-8+4=-x-4+4 [add 4 on both sides]
-4=x
x=-4