Algebra 1 - Comparing two graphs (Also related to my previous question but it doesn't matter)

Question

Compare the graphs of these two equations:

1. f(x) = 2x
2. f(x) = 2.5x

Answer 1

1. Both graphs are straight lines, of the general form y = mx + b where m is the slope and b is the y-intercept
2. b = 0 for both graphs, so they both cross the y-axis at y = 0
3. The graphs have different slopes. The graph with slope m = 2.5 is steeper than the graph with slope m = 2