Question

How do you find the solution of the system of equations `x + 3y = 19` and `x - y = -1`?

Answer 1

`x=4`
`y=5`

Explanation:

`x+3y=19` --- (1)
`x-y=-1` --- (2)

(1) - (2)

`4y=20`
`y=5` --- (3)

Sub (3) into (2)

`x-5=-1`
`x=4`