ACT Preparation / Unit 11 ACT 1029 short lesson, about 20 seconds
Direct Variation
Captions available
The idea
y varies directly with x when y = kx for a constant k. Doubling x doubles y, and the graph is a line through the origin.
In practice
Pay varies directly with hours: $90 for 6 hours gives k = 15, so 10 hours pay $150.
Where people slip
Find k first from the given pair, then use it.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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