X+y=5

X-y=7

x + y = 5

x - y = 7

Adding, we get

2x = 12

2x/2 = 12/2

x = 6

Now for y, put the value of x in any equation(say first), then

6 + y = 5

6 - 6 + y = 5 - 6

y = - 1

Hence x = 6 y = - 1

Solution : {6, - 1}

Hope you got it.

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