Question

Question #4589c

Answer 1

So we're going to use elimination

`color(white)(+)4x − 2y = 12`
`color(white)(+)`
`color(white)(+) color(white)(1)x + 2y = 8`

It looks like the `y`s have the same coefficient, but different signs. But, if we add them together, `-2+2` gives us `0` which is what we want.

`color(white)(+)4x − 2y = 12`
`color(black)(+)`
`color(white)(+) color(white)(1)x + 2y = 8`
..........................
`color(white)(+) 5x = 20`

Now let's simplify

`5x = 20`

`x = 4`