Direct variation
Use direct variation (y = kx) to find a total or a constant of variation in context. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
The cost to buy photocopies varies directly with the number bought. Each copy costs $1.00. How much do 3 photocopies cost?
Answer: 3
See one solved, step by step
The cost to buy arcade tokens varies directly with the number bought. Each token costs $0.20. How much do 4 arcade tokens cost?
📘 Worked solution
1cost = $0.20 · n, n = 4In direct variation, cost = k * n, where k is the rate per token and n is how many you buy.
2cost = $0.20 · 4 = $0.80Substitute n = 4 and multiply.
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