VOCABULARY CARDS

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VOCABULARY CARDS
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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?
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Let a represent Abraham Lincolns age.
Abraham Lincolns age
John F. Kennedys age




a
8
43
a 8 43
a 51
Abraham Lincoln was 51 years old when he became
president.
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Teacher Example 1 Solving Equations by Adding
Solve y 23 39. Check your answer.
Add 23 to both sides to undo the subtraction.
y 62
Check y 23 39
Substitute 62 for y in the equation.
62 is the solution.
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Student Practice 1
Solve a 4 7. Check your answer.
Add 4 to both sides to undo the subtraction.
a 11
Check a 4 7
Substitute 11 for a in the equation.
11 is the solution.
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Teacher Example 2 Solving Equations by Adding
Solve 78 s 15. Check your answer.
Add 15 to both sides to undo the subtraction.
93 s
Check 78 s 15
Substitute 93 for s in the equation.
93 is the solution.
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Student Practice 2
Solve 57 c 13. Check your answer.
Add 13 to both sides to undo the subtraction.
70 c
Check 57 c 13
Substitute 70 for c in the equation.
70 is the solution.
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Teacher Example 3 Solving Equations by Adding
Solve z 3 12. Check your answer.
Add 3 to both sides to undo the subtraction.
z 15
Check z 3 12
Substitute 15 for z in the equation.
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15 is the solution.
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Student Practice 3
Solve g 62 14. Check your answer.
Add 62 to both sides to undo the subtraction.
g 76
Check g 62 14
Substitute 76 for g in the equation.
76 is the solution.
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1. 2. 16 x 14 3. Susan is taller than
James. The difference in their height is 4
inches. James is 62 inches tall. How tall is
Susan?
1.9 Warm-Up