Question

Please help with substitution!

Answer 1

2. If
`y=2x+11`, then in the second equation we'd get

`y+x=5\implies(2x+11)+x=5\implies3x+11=5\implies3x=-6\implies x=-2`

Then we get
`y=2(-2)+11=7`.

3. If
`-5x+y=-1`, then
`y=5x-1`, and substituting this into the second equation gives

`y-4x=-3\implies(5x-1)-4x=-3\implies x-1=-3\implies x=-2`

which gives

`y=5(-2)-1=-11`