exam Maths Puzzle Numerical Ability

Can someone please explain the System of linear equation by substitution. Thank you

5X + 2Y = -1
2X - y = -13

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please help and thanks very much ,

4. Solve the system of equations using the substitution method.
If the answer is a unique solution, present it as an ordered pair: (x, y). I solve please 3(x-2)sqrt-9=0 andsolve 2/3-3/x=1/x-6 help