SOLUTION: x+y=6 x-y=12

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Question 34053This question is from textbook
: x+y=6
x-y=12 This question is from textbook

Answer by algebrapro18(249) About Me  (Show Source):
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x+y=6
x-y=12

solve the second eqution for x
x=12+y

substitute 12+y in for x in the first equation
(12+y)+ y = 6
12+2y=6
2y=-6
y=3

plug 3 into the equation that sloved for x
x=12+y
x=12+3
x=18