Question

If x+y=16 and x-y=-2, what is the value of xy?

Answer 1

Y=7 and

X=9

Explanation:

X+Y=16

X=2+Y

2+Y+Y=16

2+2Y=16

2Y=16-2

2Y=14

2Y/2=14/2

Y=7

X =2+Y

So X=9