exam Maths Puzzle Numerical Ability

3x^2+7=31
7n^2-6=15
5x^2-12=5
what does x =

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exam Other Question

This problem is on Solving Systems of Equations In Three Variables

(1) X-4y+3z=-27
2x+2y-3z=22
4z=-16

(2) 3x-2y+4z=15
x-y+z=3 All parallel lines have the same slope, and not all systems of equations have common solution. Is that true or false?