Question

How do you solve the simultaneous equations `4x - y = 5` and `2x + y = -2`?

Answer 1

I fund:
`x=1/2`
`y=-3`

Explanation:

You can add the two equations (in column) as:
`{4x-y=5`
`{2x+y=-2`
`6x+0=3`
`x=3/6=1/2`
Substituting back into the first equation:
`4*1/2-y=5`
`2-y=5`
`y=-3`