Question

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

Answer 1

Lettuce solve for `y`
`1^(st)` equation
`-x-y=2`
`-y=2+x`
`color(red)(y=-2-x`

`2^(nd)` equation
`x-y=-1`
We already know `-y`
`x+2+x=-1`
`2x=-1-2`
`2x=-3`
`x=-3/2`
`color(red)(x=-1.5`
`y=-2-x`
`y=-2-1.5`
`color(red)(y=-0.5`