Question

How do you solve the system `4x - y = 6` and `3x + 2y = 21`?

Answer 1

I found:
`x=3`
`y=6`

Explanation:

From the first equation isolate `y`:
`y=4x-6`
Substitute for `y` into the second equation:
`3x+2(4x-6)=21`
`3x+8x-12=21`
`11x=33`
`x=3`
Substitute this back into the first equation:
`y=12-6=6`