exam Maths Puzzle Numerical Ability

ABCD is a trapeziod with line segment BC perpindicular to line segment AB and line segment BC perpindicular to line segment CD, AB=13, BC=12, and CD=8. A line segment is drawn from

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how do you solve x-8y=37 3x+8y=-17 by using the elimanation method it doesnt really help with the steps can you or anybody show me. Y=Square root of (x.