Choice B is correct. The two lines cross at (2,-3)
As algebraic proof, you can plug in (x,y) = (2,-3) into each equation and verify like so
y = 2x-7
-3 = 2(2) - 7 ... replace x with 2, y with -3
-3 = 4 - 7
-3 = -3 .... true equation
Repeat for the second equation
y = -x-1
-3 = -2-1 .... replace x with 2, y with -3
-3 = -3 ... true equation
both equations are true when (x,y) = (2,-3) so the solution to the system has been confirmed.
