exam Maths Puzzle Numerical Ability

Solve the following for the variable Y
12xyt=36R

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exam Other Question

The measure of an angle of depression is 36 degress. The altitude of a plane is 9,000 ft. Find the ground distance d from the plane to runway. Find the flight distance s from the p i know how to do linear combination, but i cannot get the right answer for this problem:
2x+y+52=2y+50
2x+y+52=x-3y+131

I need help finding x and y.

Thank you!