The ordered pair (2,5) satisfies all three equations. That means that (2,5) is a solution.
2x - y = -1
3x + 5y = 31
7x - 2y = 4
(the numbers work, I tried them all)
What does this mean about the intersection(s) of the lines?
The three lines all intersect at this point 2,5
+1443 
