**PROBLEM 1-7-4**

The number of times a dog barks depends on the number of cars passing.

How many cars have passed when a dog barks 22 times? How many barks for 5 cars?

CARS |
BARKS |

6 |
4 |

7 |
7 |

8 |
10 |

9 |
13 |

10 |
16 |

Looking at the table, every time another car passes, there are 3 more barks. Therefore the dog barks 6 more times which would equal 2 more cars passing, so **12 cars passed when the dog barked 22 times. **

If one less car passed, then there would be 3 less barks. So, when **5 cars pass, the dog only barks 1 time.**