Summer Math Packet Worksheet - Grayslake Middle School Page 7
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14Part III:
Substitution
Evaluate each expression.
EXAMPLE:
2
Evaluate 2x – y
if x = 5 and y = ‐3
2
2(5) – (‐3)
*Remember to substitute first
10 – 9
* Follow the order of operations
1
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19.
2x + y if x = 7 and y = 4
20.
2x + y
if x = ‐3 and y = ‐7
2
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21.
x
‐ y + 7 if x = ‐1 and y = ‐3
2
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Part IV:
Algebraic Equations
Solve each equation below.
EXAMPLE:
Proportions:
Evaluate:
3x – 6 = 5x + 12
Evaluate:
x – 2 = 6
+ 6 + 6
3 9
3x = 5x + 18
‐5x ‐5x
When solving
9(x – 2) = 6(3)
‐2x = 18
proportions, cross
9x – 18 = 18
‐2 ‐2
mulitply
+18 +18
x = ‐9
9x = 36
9 9
x = 4
7
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