Question

HELP ASAP!!

What is the equation of the following line written in general form?
y - x + 1 = 0
x - y + 1 = 0
-x - y + 1 = 0
Feel free to explain how I do this b/c I have a few assignments like this

Answer 1

I'm pretty sure it would be x - y + 1 = 0 because if you plug in one of the coordinates into each equation, this is the only one that works.

y - x + 1 = 0
2 - 1 + 1 = 0
2 = 0 not correct

x - y + 1 = 0
1 - 2 + 1 = 0
0 = 0 correct

-x - y + 1 = 0
-1 - 2 + 1 = 0
-2 = 0 not correct