Houghton Mifflin Harcourt Algebra 1, 2015
HM
Houghton Mifflin Harcourt Algebra 1, 2015 View details
1. Solving Equations
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Exercise 21 Page 9

Write an equation to solve for the unknown value.

$7

Practice makes perfect

In this exercise, the cost of a discount card relates to the total cost of transportation. The total cost is given, and we need to use it to determine the cost of discount card. We can rewrite the given information as algebraic expressions to create an equation for the discount card.

Given Information Algebraic Expression
cost of the discount card c
15 bus passes and the discount card c + 15 * 1.50
the total cost is 29.50, and it is 15 bus passes and the discount card 29.50 = c + 15 * 1.50

Now that we have the equation, we can solve it for c, the discount card cost.

29.50 = c + 15 * 1.50
29.50 = c + 22.50
29.50 - 22.50 = c + 22.50 - 22.50
7 = c
c = 7

Therefore, the cost of the discount card is $7.