Question

Solve the following system of equations. Please show your work to receive full credit.
x - y = 13
2x + y = 2

Answer 1

just add

x - y = 13
2x + y = 2
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??

Answer 2

x - y = 13
2x + y = 2 ( adding both the equations)
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3x+0 =15
3x=15
x=15/3
x=5
Since x - y = 13 (substituting x=5 in this eq)
5- y = 13
5-13=y
-8=y
i.e. y=-8
thus {x,y}={5,-8}

Answer 3

wow that was fast .. o.o