exam Maths Puzzle Numerical Ability

x+5y=10
-2x-10y=-20

2x+10y=20
-2x-10y=-20
0 = 0

Just double check to make sure this is right?

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exam Other Question

The question is; perform the indicated operations and write the result in standard form (a+bi)
#42)
the square root of -12 multiplied by(the square root of -4 minus square ro Solve by substitution or elimination:
x=3y+11
2x+5y=0
I dont understand could I please have help for this question?