Question

(2,?) is on the line 4x – 5y = -7. Find the other half of the coordinate.

Answer 1

`(x,y)=(2,?) \\ x=2 \\ y=? \\ \\ 4x-5y=-7 \\ 4 * 2-5y=-7 \\ 8-5y=-7 \\ -5y=-7-8 \\ -5y=-15 \\ y=(-15)/(-5) \\ y=3`

The coordinate is (2,3).