positive means that t increases as x increases. The line rises up to the right
negative means that y decreases as x increases. The line falls down to the right.
Visit wolframalpha.com and type in a few functions to see how the value of m affects the graph.
For example, if you enter "y=-3x-5" it will show you the graph and some other info.
When writing an equation in slope-intercept form, does be have to be a positive number or can it be negative? For example, y=-3x-5.
3 answers
Steve, that was an excellent explanation.
aww, shucks. >scuff scuff<