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marissa [1.9K]
3 years ago
7

The amount of money Sally earns, P, varies directly with the number, n, of necklaces she sells. When Sally sells 15 necklaces, s

he earns $150. Write the equation that relates P and n. How much money would she earn if she sold 4 necklaces?
Mathematics
1 answer:
maksim [4K]3 years ago
4 0

Answer:

Equation: P = 10n

P = 40 when n = 4

Step-by-step explanation:

Given

Direct Variation: P ∝ n

When n = 15, P = 150

Required

Determine the equation

Her earnings if she sold 4 necklaces

P ∝ n

Convert variation to equation

P = kn

When P = 150, n = 15 (Substitute these values in the given equation)

150 = k * 15

Divide both sides by 15

\frac{150}{15} = \frac{k * 15}{15}

10 = k\\k = 10

Substitute k = 10 in P = kn

P = 10 * n

P = 10n ------- Equation that relates P and n

When she sold 4 necklaces, n = 4

Substitute n = 4 in the formula above

P = 10 * 4

P = 40

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