Question

-x + y = 12 ; x + y = 14​

Answer 1

‐x+y=12

y=12+x.

x+y=14

substitute y=12+x

x+12+x=14

2x=14‐12

2x=2

x=2/2

x=1

y=12+x

y=12+1

,y=13

verification

‐1+13=12

1+13=14

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