Question

How do you solve x = y - 1 and y = 4 - 2x?

Answer 1

`y=2`
`x=1`

Explanation:

`x=y-1` --- (1)
`y=4-2x` --- (2)

Sub (1) into (2)

`y=4-2(y-1)`
`y=4-2y+2`
`3y=6`
`y=2` --- (3)

Sub (3) into (1)
`x=y-1`
`x=2-1`
`x=1`