exam Maths Puzzle Numerical Ability

what is the linear combination of
2x-y=-3
-5x+y=9
would you also provide two more answers for me.
2x-3y=-16
x+3y=10
and
10x-5y=5
2x+5y=-5
thats all thanks for the help i realy need it!

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exam Other Question

Solve the given system of equations:

2x+2y =6
x + y + z =1
3x+ 4y- z =13

This is a 3x3 matrix.
Okay here goes nothing..

The sum of the perimeters of two squares is 40 inches. The sum of their areas is 58 square inches. What are the dimensions of the squares?