(iii) x+y= 12 and x-y=2
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x+y=12and x-y=2
x=12-y
putting the value of x in equation 1
x-y=2
12-y-y=2
12-2y=2
-2y=2-12
-2y=-10
y=5
putting the value of y in equation 2
x-y=2
x-5=2
x=2+5
x=7
x=7andy=5
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