Question

System of Equations

y=-x-1
y+x=3

Solve?

Answer 1

Solve by substitution


`\sf{y=-x-1}`

`\sf{y+x=3}`

Just plug in y=-x-1 into y+x=3

So we get:


`\sf{(-x-1)+x=3}`

Simplify that:


`\sf{-1=3}`

And since that is not true, that means this system of equations has no solutions!