if x+y=5,x-y=3,then find xy
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x+y=5.....(1)
x-y=3......(2)
by adding (1) and (2), we get
2x=8
x=4
4+y=5..
y=5-4
y=1
xy=4×1=4
x-y=3......(2)
by adding (1) and (2), we get
2x=8
x=4
4+y=5..
y=5-4
y=1
xy=4×1=4
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