Question

27.If x + y = 8 and x - y = 4, then the value of xy​

Answer 1

Answer:

x=6

y=2

x+ y=8

x-y=4

add the both

2x=12

x=6

6+y=8

y=8-6

y=2

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Step-by-step explanation:

Answer 2

Step-by-step explanation:

x+y=8

y=8-x. ......1

x-y=4. .......2

put the value of y in 2

x-(8-x)=4

x-8+x=4

2x-8=4

2x=4+8=12

x=6

now put the value of x in 1

y=8-6

y=2

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