solve the equation '2x-y=2;x+3y=15' . hence x+y is
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2x-y=2 ---------(1) , x+3y=15 -———(2)
eq (2) *2
2x- y =2
2x+6y=30
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-7y = -28
7y = 28
y = 4
substitute value of y in eq (1)
2x-y=2
2x-4=2
2x=6
x=3
To find-
x+y = 3+4 = 7
hope it helps....
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