Question

If x + y = 8 and x - y = 4 . Find the value of xy

Answer 1

Answer:

Let x+y = 8 ……(1)

and x-y = 4 ……(2)

Adding (1) and (2) , we get

x = 6 and putting this value in (1), we get

y = 2

So according to these values we get

x×y = 6×2 = 12

But we are given x×y = 18 , which is invalid.

But according to the values that we got above we have

x÷y = x/y = 6/2 = 3.

So, 3 is the right answer.

Step-by-step explanation:

Answer 2

Step-by-step explanation:

x + y = 8

x - y = 4

Adding both

2x = 12

x = 6

6+ y = 8

y = 2

xy = 6 × 2

= 12

mark me brainlist