exam Maths Puzzle Numerical Ability

can you please help me solve this:Ax+By=-28 contains the points (-8,4)(-11,9)

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ISBN 1 902 214 13X - Essential Mathematics Book 8 - David Rayner

The height of a balloon increases at a steady rate of x metres in t hours. How far will the balloon rise in one hour? How far will the balloon rise in 4 hours? r + sy = t