Question

How do you solve the system of equations `4x-2y=-20` and `7x+2y=-2`?

Answer 1

`x = -2`
`y = 6`

Explanation:

Add both equations. The `2y` terms cancel out:

`11x = -22 => x = -2`

Substitute `x = -2` on any equation, for example the first one:

`-2y -8 = -20 => -2y = -12 => y = 6`