Question

6. If x + y = 7 and x- y = 3, find xy. *
(2 Points)
O 10
29
13
0 20​

Answer 1

x + y = 7 ---i

x - y = 3 ---ii

- + -

2y = 4

y = 2

Putting the value of y in eq (i)

x + 2 = 7

x = 5

Therefore, xy = 5*2 =10