exam Maths Puzzle Numerical Ability

How do I solve this? -4x+4y=-12
x-4y=15

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exam Other Question

Perform the indicated operations:

-4 [6 9] + 5[-2 6]
[-5 7] [3 -5] A plane is flying at an altitude of 1.5 km. The pilot wants to descend
into an airport so that the path of the plane makes an angle of 5 degrees with the ground. How far from the airport (horizontal distance) shoul the descent begin?