Question

How do you solve the following system?: `x + y =1 ,2x-y=-2`

Answer 1

`x+y=1` (Consider this equation as equation 1)
`2x−y=−2` (Consider this equation as equation 2)

Adding equation 1 & 2 we get
`3x=-1`
This implies `x=-1/3`
Substitute this in equation 1
`-1/3+y=1`
`y=1+1/3`
`y=3+1/3`
`y=4/3`