Question

How do you solve `x+y=6` and `x-y=9`?

Answer 1

`x=7.5`
`y=-1.5`

Explanation:

`x+y=6`
`x-y=9`
Adding both the equations
we get
`x+y+x-y=6+9`
or
`2x=15`
or
`x=15/2`
or
`x=7.5`=======Ans `1`
From Equation
`x+y=6` we get
`y=6-x`
or
`y=6-7.5`
or
`y=-1.5`======Ans `2`