Question

Keisha bought some books for $5 each and received a discount of $7 off of her total purchase. She spent $58 after the discount. How many books did she buy?

(a) Write an equation that could be used to answer the question above.
first, choose the appropriate form. then, fill in the blanks with the
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(b) Solve the equation in part (a) to find the number of books
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Answer 1

a) 2nd form: 5b-7=58

b) 13 books

Explanation:

Equation:

5b-7=58

b) 5b=65

b=13

Answer 2

• 5b -7 = 58
• b = 13

Explanation:

You want an equation and its solution to tell you the number of $5 books that were purchased for $58 with a $7 discount coupon.

Cost

The cost of b books at $5 each is 5b.

After a $7 discount is subtracted, the cost is 5b -7.

That cost is said to be $58, so an appropriate equation is ...

5b -7 = 58

Solution

Adding 7 gives ...

5b = 65

Dividing by 5 tells the number of books:

b = 13

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