Question

If x+y=12 and x-y=2 then xy/2=

Answer 1

Answer:

Here, x=7, y=5.

Therefore, xy/2 =35/2=17.5.

Answer 2

Answer:

x+y=12...................(1)

x-y=2............(2)

Add (1) and (2)

You will get 2x=14

x=14÷2

x=7

Now, subtract (1) and (2).

You will get 2y=10

y=10÷2

y=5.

Now, we substitute the values of x and y in xy/2:

5×7/2

=35/2

=17.5

Hope this helps :D