holt ca course 1 1-9 solving equations by adding af1.1 write and solve one-step linear equations in...
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![Page 1: Holt CA Course 1 1-9 Solving Equations by Adding AF1.1 Write and solve one-step linear equations in one variable. California Standards](https://reader036.vdocuments.mx/reader036/viewer/2022072117/56649f255503460f94c3c0a5/html5/thumbnails/1.jpg)
Holt CA Course 1
1-9 Solving Equations by Adding
AF1.1 Write and solve one-step linear equations in one variable.
California Standards
![Page 2: Holt CA Course 1 1-9 Solving Equations by Adding AF1.1 Write and solve one-step linear equations in one variable. California Standards](https://reader036.vdocuments.mx/reader036/viewer/2022072117/56649f255503460f94c3c0a5/html5/thumbnails/2.jpg)
Holt CA Course 1
1-9 Solving Equations by Adding
When John F. Kennedy became president of the United States, he was 43 years old. He was 8 years younger than Abraham Lincoln was when Lincoln became President. How old was Lincoln when he became president?
![Page 3: Holt CA Course 1 1-9 Solving Equations by Adding AF1.1 Write and solve one-step linear equations in one variable. California Standards](https://reader036.vdocuments.mx/reader036/viewer/2022072117/56649f255503460f94c3c0a5/html5/thumbnails/3.jpg)
Holt CA Course 1
1-9 Solving Equations by Adding
Abraham Lincoln’s age
John F. Kennedy’s age– = 8
Let a represent Abraham Lincoln’s age.
a – =8 43
a – 8 = 43
+ 8 + 8
a = 51
Abraham Lincoln was 51 years old when he became president.
![Page 4: Holt CA Course 1 1-9 Solving Equations by Adding AF1.1 Write and solve one-step linear equations in one variable. California Standards](https://reader036.vdocuments.mx/reader036/viewer/2022072117/56649f255503460f94c3c0a5/html5/thumbnails/4.jpg)
Holt CA Course 1
1-9 Solving Equations by Adding
y – 23 = 39 23 is subtracted from y.
+ 23
y = 62
Add 23 to both sides to undo the subtraction.
Check y – 23 = 39Substitute 62 for y in the equation.
Solve y – 23 = 39. Check your answer.
62 is the solution.39 = 39?
Example 1A: Solving Equations by Adding
62 – 23 = 39?
+ 23
![Page 5: Holt CA Course 1 1-9 Solving Equations by Adding AF1.1 Write and solve one-step linear equations in one variable. California Standards](https://reader036.vdocuments.mx/reader036/viewer/2022072117/56649f255503460f94c3c0a5/html5/thumbnails/5.jpg)
Holt CA Course 1
1-9 Solving Equations by Adding
78 = s – 15 15 is subtracted from s.+ 15
93 = s
Add 15 to both sides to undo the subtraction.
Check 78 = s – 15
Substitute 93 for s in the equation.
Solve 78 = s – 15. Check your answer.
93 is the solution.78 = 78?
Example 1B: Solving Equations by Adding
78 = 93 – 15?
+ 15
![Page 6: Holt CA Course 1 1-9 Solving Equations by Adding AF1.1 Write and solve one-step linear equations in one variable. California Standards](https://reader036.vdocuments.mx/reader036/viewer/2022072117/56649f255503460f94c3c0a5/html5/thumbnails/6.jpg)
Holt CA Course 1
1-9 Solving Equations by Adding
z – 3 = 12 3 is subtracted from z.+ 3
z = 15
Add 3 to both sides to undo the subtraction.
Check z – 3 = 12
Substitute 15 for z in the equation.
Solve z – 3 = 12. Check your answer.
15 is the solution.12 = 12?
Example 1C: Solving Equations by Adding
15 – 3 = 12?
+ 3
![Page 7: Holt CA Course 1 1-9 Solving Equations by Adding AF1.1 Write and solve one-step linear equations in one variable. California Standards](https://reader036.vdocuments.mx/reader036/viewer/2022072117/56649f255503460f94c3c0a5/html5/thumbnails/7.jpg)
Holt CA Course 1
1-9 Solving Equations by Adding
57 = c – 13 13 is subtracted from c.
+ 13
70 = c
Add 13 to both sides to undo the subtraction.
Check 57 = c – 13
Substitute 70 for c in the equation.
Solve 57 = c – 13. Check your answer.
70 is the solution.57 = 57?
57 = 70 – 13?
+ 13
Check It Out! Example 1