# Lesson 3

Using Equations to Solve Problems

### Problem 1

A car is traveling down a highway at a constant speed, described by the equation \(d = 65t\), where \(d\) represents the distance, in miles, that the car travels at this speed in \(t\) hours.

- What does the 65 tell us in this situation?
- How many miles does the car travel in 1.5 hours?
- How long does it take the car to travel 26 miles at this speed?

### Solution

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### Problem 2

Elena has some bottles of water that each holds 17 fluid ounces.

- Write an equation that relates the number of bottles of water (\(b\)) to the total volume of water (\(w\)) in fluid ounces.
- How much water is in 51 bottles?
- How many bottles does it take to hold 51 fluid ounces of water?

### Solution

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### Problem 3

There are about 1.61 kilometers in 1 mile. Let \(x\) represent a distance measured in kilometers and \(y\) represent the same distance measured in miles. Write two equations that relate a distance measured in kilometers and the same distance measured in miles.

### Solution

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(From Unit 5, Lesson 2.)### Problem 4

In Canadian coins, 16 quarters is equal in value to 2 toonies.

number of quarters | number of toonies |
---|---|

1 | |

16 | 2 |

20 | |

24 |

- Complete the table.
- What does the value next to 1 mean in this situation?

### Solution

### Problem 5

Each table represents a proportional relationship. For each table:

- Fill in the missing parts of the table.
- Draw a circle around the constant of proportionality.

\(x\) | \(y\) |
---|---|

2 | 10 |

15 | |

7 | |

1 |

\(a\) | \(b\) |
---|---|

12 | 3 |

20 | |

10 | |

1 |

\(m\) | \(n\) |
---|---|

5 | 3 |

10 | |

18 | |

1 |

### Solution

### Problem 6

Write a multiplication equation that corresponds to each division equation.

- \( 10 \div 5 = {?} \)
- \( 4.5 \div 3 = {?} \)
- \( \frac12 \div 4 = {?} \)