exam Maths Puzzle Numerical Ability

would these pair of equations be parallel, perpendicular, or neither?
4x-3y=36;3x+4y=20?? how about ax-by=c;-ax+by=d??

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exam Other Question
solve the system:
-32+3z=4(x-2y)
4(x-2y-z)=-36
-2(2x+y)+2z=-12 when solving for quadric equations how do you get x equal to zero. do you do GCF?