Question

How do you solve `5x-y =20` and `6x+49 =y` using substitution?

Answer 1

`x=-69`
`y=-365`

Explanation:

Given -

`5x-y=20` ---------------------(1)
`6x+49=y` ---------------------(2)

Substitute `y=6x+49` in equation (1)

`5x-(6x+49)=20`
`5x-6x-49=20`
`-x=20+49=69`
`x=-69`

Substitute `x=-69` in equation (2)

`y=6(-69)+49`
`y=-414+49=-365`
`y=-365`