Main Idea

Example 1: Write an Algebraic Equation

Example 2: Real-World Example

Example 3: Real-World Example

• Write algebraic equations from verbal sentences and problem situations.

Write an Algebraic Equation

MONEY The cost of a book purchased online plus $5 shipping and handling comes to a total of $29. Write an equation to find the cost of the book.

Answer: b + 5 = 29

A. s – 11 = 92

B. s + 11 = 92

C. 11 + 92 = s

D. 11s = 92

MUSIC On Friday, Jordan downloaded 11 songs to his MP3 player. He then had a total of 92 songs. Write an equation to find the number of songs s he had on his MP3 player before he downloaded the songs on Friday.

TRAVEL Morgan is driving to his sister’s home. He has 174 miles to go after dinner. He has driven 532 miles. Define a variable. Then write an equation that could be used to find the distance of the whole trip.

Answer: n – 532 = 174; n = total distance

A. m – 13 = 22

B. 22 – m = 13

C. m + 13 = 22

D. 13m = 22

PARTY PLANNING Marissa spent $13 at the party supply store. She had $22 left. Write an equation that could be used to find how much money m she had before she went to the store.

MONEY The eighth grade has $35 less in its treasury than the seventh-grade treasury. Given s, the number of dollars in the seventh-grade treasury, write an equation that can be used to find e, the number of dollars in the eighth-grade treasury.

Answer: e = s – 35

A. s + f = 84

B. s = f – 84

C. s = f + 84

D. f = s + 84

MONEY At their second fundraiser, the Girl Scout troop raised $84 more than their first fundraiser. Given f, the amount raised at the first fundraiser, write an equation that can be used to find s, the amount raised at the second fundraiser.