Question

How do you solve `-14= -20y - 7` and `10y + 4 = 2x`?

Answer 1

`(x,y) = (15/4, 7/20)`

Explanation:

Given:
[1]`color(white)("XXX")-14=-20y-7`
[2]`color(white)("XXX")10y+4=2x`

Re-arranging [1] to solve for `y`
[3]`color(white)("XXX")20y = 7`
[4]`color(white)("XXX")y = 7/20`

Substituting `7/20` (from [4]) for `y` in [2]
[5]`color(white)("XXX")10*(7/20)+4 = 2x`

[6]`color(white)("XXX")7/2+8/2 = 2x`

[7]`color(white)("XXX")x= 15/4`