exam Maths Puzzle Numerical Ability

ABCD is parallogram. If the two diagonals are equal,find the measure of angleABC

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solve using cramers rule:

2x-3y-3z=25
3x+1y-1z=-5
5x-2y-4z=32

I am very confused with this problem...please help! find the value of Y so that the line through (-2,-1) and (10,y) is perpendicular to the line through (6,-2) and (5,7)

Thanks