Which graph has:
1) Positive Slope?
2) Negative Slope?
3) Zero Slope?
4) Undefined Slope?
(Enter the letter of the graph)
1) Graph A increases from left to right, so it is increasing.
2) Graph C decreases from left to right, so it is decreasing.
3) Graph B stays constant from left to right, so it has zero slope.
4) Graph D is a vertical line, a rise without a run, so it has undefined slope.