IXL | Find a value using two-variable equations: word problems

This equation shows how the revenue at Stefan's Auto Wash depends on the number of customers.

d = 16c

The variable c represents the number of customers, and the variable d represents the revenue. After serving 1 customer, how much revenue will Stefan's Auto Wash have?

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Learn with an example

question

This equation shows how the time required to complete an online shopping transaction is related to the number of products being purchased.

t = 7p

The variable p represents the number of products, and the variable t represents the time required to complete the transaction. How long does it take to complete a transaction with 2 products?

seconds

solution

An online shopper is buying 2 products. Plug in p = 2.

Plug in p = 2

7 × 2

Plug in p = 2

Multiply

It takes 14 seconds to complete a transaction with 2 products.

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