Question

x+y=8 x-y =4 find xy
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Answer 1

Answer:

by elimination method you will get

2x=12

x=6

put in 1st equation you will get y=2

xy=6×2=12

Step-by-step explanation:

Hope it helps

Answer 2

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$x + y = 8 \: \: \: \: (i)$

$x - y = 4 \: \: \: \: (ii)$

$so$

$x + y = 8$

$x = 8 - y \: \: \: \: (iii)$

Putting the value of x in equation (ii)

$(8 - y) - y = 4$

$8 - 2y = 4$

$- 2y = 4 - 8$

$- 2y = - 4$

$y = 2$

Put the value of y=2 in equation (iii)

$x = 8 - 2$

$x = 6$

So y=2 and x=6

$i.e. \: xy = 2 \times 6 = 12$