exam Maths Puzzle Numerical Ability

Please help i do not understand how to solve this equation??
x-5y=10
2x-10y=20

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exam Other Question

In a right triangle, find the length of the side not given.

One side is a; one side = 2 and the other side is sqrt (13);

What is the length of side a; please put in simple terms that i can understand

v=r+at, for the a