ACT Preparation / Unit 9 ACT 0809 short lesson, about 20 seconds
Slope
Captions available
The idea
The slope of a line is rise over run: m = (y₂ − y₁)/(x₂ − x₁). It is the rate of change of y per unit of x, in units of y per x.
In practice
Through (1, 3) and (4, 9): m = 6/3 = 2.
Where people slip
Subtract in the same order, top and bottom. Positive slope rises left to right; negative slope falls.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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