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1. If the slope m is positive, then the graph is increasing from left to right
y = +mx + b
2. If the slope m is negative, then the graph is decreasing from left to right
y = - mx + b
3. If the slope m is zero, then the graph is a horizontal line
y = mx + b
y = m(0) + b
y = b ; where b is a constant term
4. If the slope m is undefined, then the graph is a vertical line
x = b (where b is a constant term)
5. If the slope m is -7, then the graph is decreasing from left to right
y = mx + b
y = -7x + b
6. If the slope m is 4/3, then the graph is increasing from left to right
y = mx + b
y = 4/3x + b