Question

find x if x + Y is equals to 5 and x minus y is equals to 7

Answer 1

x+y=5,

x-y=7

By addition of both equations we get

2x=12..........y gets cancelled.

x=12/2=6

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Answer 2

x+y=5...(1)
x-y=7....(2)
by taking eqn (1) and(2) we get
2y=-2
y=-2/2
y=-1
putting the value of y in eqn (1)we get
x+y=5
x-1=5
x=5+1
x=6(ans)