Page 141 - Math Course 3 (Book 1)
P. 141
Equations with Slope and Points on the Line
Real World Example
A student is starting college in 2004 and has saved $400 to use for textbooks. Use the prediction equation y
= 3.5x + 57.65, where x is the years since 1997 and y is the average cost of a college textbook, to determine
whether he will have enough money for 5 textbooks.
A. Five textbooks is $395, so he will have enough money.
B. Five textbooks is $410.75, so he will not have enough money.
C. Five textbooks is $400, so he will have enough money.
D. Five textbooks is $420, so he will not have enough money.
Answer
Skill Practice!
Write an equation of the line that passes through each point with the given slope.
1. 2. 3.
4. (1, 9), m = 4 5. (4, 2), m = –2
6. (2, –2), m 3 7. (3, 0), m = 5
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