3x-4y=-5 y=4x-2 Is (1,2) a solution of the system?

If you want to check if (1,2) is a solution to the system, you have to plug the x and y values back into both equations. If they work for one equation, but not the other, than the coordinates are not a solution to the system.

3 (1) - 4 (2) = - 5

3 - 8 = - 5

-5 = - 5

2 = 4 (1) - 2

2 = 4 - 2

2 = 2

Since both of these checks are true, then (1,2) is a solution to the system.