exam Maths Puzzle Numerical Ability

Could someone be so kind in helping me with this problem?

I need to solve the following systems by substitution:

4x - 12y = 5
-x + 3y = -1

Thanks so much,
Ashley

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exam Other Question

If seven coins are tossed, in how many ways can they fall? log2(x+3)+log2(x-3)=4