exam Maths Puzzle Numerical Ability

Please help.Solve each of the systems by substitution
5x-2y = -5
y - 5x = 3
Thank you.

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exam Other Question

An astronaut standing on the surface of the moon throws a rock upward. The height of the rock is given by s=-2.7t^2+27t+6.3, where s is the height in metres and t is the time in seconds.What was the initial height of the rock? A plane and a line ________ intesect in a single point.

(a) always (b) sometimes (c) never (d) not enough information