Example 1 Solve each equation. Check your solution.- n + 6 = 8 2. 7 = y + 2
- m + 5 = 3 4. - 2 = a + 6
Example 2 5. BAR DIAGRAM Orville and Wilbur Wright made the first airplane flights
in 1903. Wilbur’s flight was 364 feet. This was 120 feet longer than
Orville’s flight. Draw a bar diagram to represent the flights. Then write
and solve an equation to find the length of Orville’s flight.
Example 3 Solve each equation. Check your solution.
6. x - 5 = 6 7. - 1 = c - 6
Example 4 8. PRESIDENTS John F. Kennedy was the
youngest president to be inaugurated.
He was 43 years old. This was 26 years
younger than the oldest president to be
inaugurated—Ronald Reagan. Write and
solve an equation to find how old Reagan
was when he was inaugurated.
= Step-by-Step Solutions begin on page R1.
Extra Practice begins on page EP2.
Examples 1 and 3 Solve each equation. Check your solution.- a + 3 = 10 10. y + 5 = 11 11. 9 = r + 2
- 14 = s + 7 13. x + 8 = 5 14. y + 15 = 11
1515 r + 6 = - 3 16. k + 3 = - 9 17. s - 8 = 9 - w - 7 = 11 19. - 1 = q - 8 20. - 2 = p - 13
Examples 2 and 4 BAR DIAGRAM Write an equation. Use a bar diagram if needed. Then
solve the equation.- MUSIC Last week Tiffany practiced her bassoon a total of 7 hours. This
was 2 hours more than she practiced the previous week. How many
hours did Tiffany practice the previous week? - CIVICS In a recent presidential election, Ohio had 20 electoral votes.
This is 14 votes less than Texas had. How many electoral votes did Texas
have? - AGES Zack is 15 years old. This is 3 years younger than his brother Louis.
How old is Louis? - BASKETBALL The Miami Heat scored 79 points in a recent game. This was
13 points less than the Chicago Bulls scored. How many points did the
Chicago Bulls score?
Lesson 1D Addition and Subtraction Equations 211204_213_C04L1_895130.indd 211 12/31/09 3:56 PM