X+y=100
X-y=80
X×y=?
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x+y=100...eq1
x-y=80....eq2
add 1 and 2 ,
we get:2x=180thenx=90
put in eq 1 we get y=100-90=10
therefore xy=90×10=900ans
x-y=80....eq2
add 1 and 2 ,
we get:2x=180thenx=90
put in eq 1 we get y=100-90=10
therefore xy=90×10=900ans
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