Let’s solve each problem step by step. We’re told to evaluate expressions when a variable equals a certain number. That means we replace the letter (like x or y) with the given number and then do the math.
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Part A: Evaluate when x = 9
1) x + 12 → 9 + 12 =
21
2) 8 + x → 8 + 9 =
17
3) 20 + x → 20 + 9 =
29
4) 4 + x → 4 + 9 =
13
5) x + 14 - 15 → 9 + 14 = 23, then 23 - 15 =
8
6) x - 3 → 9 - 3 =
6
7) 1 + x → 1 + 9 =
10
8) x - 1 → 9 - 1 =
8
9) x + 11 → 9 + 11 =
20
10) x + 6 → 9 + 6 =
15
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Part B: Evaluate when y = 5
11) y + 17 → 5 + 17 =
22
12) y + 18 → 5 + 18 =
23
13) y - 5 → 5 - 5 =
0
14) 12 + y → 12 + 5 =
17
15) y + 14 - 13 → 5 + 14 = 19, then 19 - 13 =
6
16) 11 - y → 11 - 5 =
6
17) y - 2 → 5 - 2 =
3
18) 9 + y → 9 + 5 =
14
19) y + 7 → 5 + 7 =
12
20) y + 15 - 5 → 5 + 15 = 20, then 20 - 5 =
15
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Final Answer:
A)
1) 21
2) 17
3) 29
4) 13
5) 8
6) 6
7) 10
8) 8
9) 20
10) 15
B)
11) 22
12) 23
13) 0
14) 17
15) 6
16) 6
17) 3
18) 14
19) 12
20) 15
Parent Tip: Review the logic above to help your child master the concept of simple algebraic equations worksheet.
