Question

How do you solve `2x-3y=4` and `x+4y=-9` using substitution?

Answer 1

`x=-1,y=-2`

Explanation:

From the secon equation we get

`x=-9-4y`
plugging this in the first one

`2(-9-4y)-3y=4`
`-18-8y-3y=4`
so

`-11y=22`

`y=-2`