Page 38 - Math Course 1 (Book 2)

Linear Equations

Real World Example

ANALYZE TABLES
Jules has a food card for Disney World. The table shows the function relating the amount of money on the
card and the number of times he has stopped to purchase food.
Number of Amount of
Food 125
stops Money($) 100
0 125
1 100 75
2 75 50
3 50 25
4 25
5 0 1 2 3 4 5

A. Determine the x-intercept, y-intercept, and zero B. In relation to the previous problem, describe what
the y-intercept of 125 means?
a. 5; 125; 5
b. 5; 5; 125 a. It represents the time when there is no money left
c. 125; 5; 125 on the card.
d. 5; 10; 15
b. It represents the original value of the card.

c. At time 0, or before any food stops, there was $125
on the card.

d. This cannot be determined.

Skill Practice!

Determine whether each equation is a linear equation. If so, write the equation in standard form.
1. xy = 6 2. y = 2 – 3x 3. 5x = y – 4

2
4. y = 2x + 5 5. y = –7 + 6x 6. y = 3x + 1

7. y – 4 = 0 8. 5x + 6y = 3x + 2

30