book Maths Puzzle Numerical Ability

Solve each of the following systems by substitution.

5x - 2y = -5
Y - 5x = 3

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Can you help me with this problem. I have tried to answer this one but I can not get pass the first step. I am not sure if I am evening doing the problem right. (2/3) (12x2 � 18 A right prism with equilateral triangular bases whose sides are 6 in. and the height of the entire prism is 9 in.