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$.
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