Question

Please i need HELP x+y=15 , x-y=3
and

Answer 1

x=9

y=6

Explanation:

x+y=15 .............(i)

x-y=3...........(ii)

Subtracting equation (ii) from equation (i)

or, x+y -(x-y)=15-3

or, x+y-x+y=12

or, 2y=12

or, y=12/2

∴y=6

Now,

Putting the value of y on equation (i),

or, x+6=15

or, x=15-6

∴x=9