Question

How do you solve the system of equations `2x - 4y = - 1` and `- x + 4y = 8`?

Answer 1

`(x, y)=(7, 15/4)`

Explanation:

`2x-4y=-1`
`-x+4y=8` => add the 2 equations, y's cancel solve for x:
`x=7` => plug in for x in one of the equations solve for y:
`-7+4y=8`
`4y=15`
`y=15/4=3 3/4`