Question

If the cost of books is $30, then the number of books is ________.

- 10
- 12
- 20
- 40

Hint:

### The defining property of a linear function graph is that it has a constant rate of change.

## The correct answer is: 10

### Here number of books : cost of books = 2:6 = 1:3

This means, that 3$ is the cost of 1book.

3 10 = 30$ is the cost of 1 10 = 10books

Thus ,10 books cost 30$.

### Related Questions to study

Determine the ratio of number of books to the cost

Determine the ratio of number of books to the cost

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The quantities compared in the graph are _____________

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We can find the time required to 420 sit ups by multiplying the time required to 105 sit ups by 4.

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We can multiply the cost of 8 dozen bananas by 3 and get the cost of 24 dozen bananas.

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We can find the number of cartons required for 540 eggs by multiplying the number of cartons required for 108 eggs by 5.

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