Lesson 9.4.3
9-114. See below:
a. Yes, they are equivalent. One way to determine this is to change both to y = mx + b form
and compare slope and y-intercept.
b. Students can multiply or divide both sides of either equation to find an equivalent
equation. For example, 2x + y = 3 and 8x + 4y = 12 are both equivalent equations.
9-115. 3280x + 1500 < 50,000, less than 14.8 pounds
9-116. See below:
a. m > 5
b. x ≤ −6
c. x > 7
d. no solution
9-117. Perfect square form: (x − 5)2 = 0; x = 5; Answers vary.
9-118. D
9-119. See below:
a. y = 2.75(1.05)x ; $4.48
b. y = 42,000(0.75)x ; 9967
c. y = 25(1.09)x ; 9% increase