2i
y=4-2x and 4x+2y = 5 can be rewritten as:
y = -2x + 4
2y = -4x + 5
Multiply all 3 terms of the first eq'n by 2: 2y = -4x + 8
Note that 2y = -4x shows up in both equations. This is enuf info on which to conclude that the 2 lines have the same slope.
