The table shows the number of texts Terri received in certain periods of time.
Time (min) 1 2 3 4
Number of Texts 3 6 9 12
1. Is the relationship between number of texts and time a proportional
relationship?
2. For each column of the table, write a fraction and find k, the constant
of proportionality.

3. Express this relationship in the form of an equation:
4. What is the rate of change?
Write the equation for each table. Let x be time or weight.
5. 6.

LESSON
4-2
1. Time (h) 1 2 3 4
Distance (mi) 35 70 105 140

2. Weight (lb) 3 4 5 6
Cost ($) 21 28 35 42