Solving Equations 1
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Adding and Subtracting Equations
Review Example:
x + 5 = 10
- 5 -5
0 5
x - 8 = 15
+8 +8
0 23
x=5
Check:
x = 23
5 + 5 = 10
23 - 8 = 15
Solving Equations using Multiplication and Division
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Multiplication and Division Equations
Review Examples:
3x = 27
=5
x=6
3x = 27
3
3
6∙ =5∙6
∙ x=6∙
x = 30
x=9
x=9
Check:
3 ∙ (9) =27
27 = 27
Yes
=5
5=5
Yes
∙ (9) = 6
6=6
Yes
Solving Multistep Equations
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Review Examples:
5n - 18 = -33
2x + 5 = 17
5n - 18 = -33
+18 +18
0 -15
2x + 5 = 17
- 5 -5
0
12
5n = -15
5n = -15
5
5
2x = 12
2
2
n = -3
CHECK
5(-3) – 18 = -33
-15 – 18 = -33
-33 = -33
Yes n = -3
x=6
CHECK
2 (6) + 5 = 17
12 + 5 = 17
17=17
Yes x = 6