Lesson 4: Practice Problems

Problem 1

A scatterplot of 10 data values. The horizontal axis is labeled “day” and the numbers 1 through 10 are indicated. The vertical axis is labeled “high temperature, in degrees Fahrenheit” and the numbers 59 through 69 are indicated. The data are as follows: 1 comma 60, 2 comma 61, 3 comma 63, 4 comma 61, 5 comma 62, 6 comma 61, 7 comma 60, 8 comma 65, 9 comma 67, 10 comma 63.

day

temperature (degrees F)

  1. What was the high temperature on Day 7?

  2. On which days was the high temperature 61 degrees?

  3. Is the high temperature a function of the day? Explain how you know.

  4. Is the day a function of the high temperature? Explain how you know.

Problem 2

The amount Lin’s sister earns at her part-time job is proportional to the number of hours she works. She earns $9.60 per hour.

  1. Write an equation in the form to describe this situation, where represents the hours she works and represents the dollars she earns.

  2. Is a function of ? Explain how you know.

  3. Write an equation describing as a function of .

Problem 3

Use the equation to complete the table, then graph the line using as the dependent variable.

In table given value of m are 0 and -2. For s are 3 and 0. A coordinate grid is given.

Problem 4 From Unit 5 Lesson 14

Solve the system of equations: