Let’s solve each equation step by step. Remember, we’re solving for the variable
y in each case.
We’ll go one by one:
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1.
8 - y = 3
Subtract 8 from both sides? No — better to think: “What number subtracted from 8 gives 3?”
→ 8 - ? = 3 → ? = 5
So,
y = 5
2.
7 - y = 3
7 - ? = 3 → ? = 4
So,
y = 4
3.
y - 8 = 1
Add 8 to both sides: y = 1 + 8 →
y = 9
4.
y - 2 = 0
Add 2 to both sides: y = 0 + 2 →
y = 2
5.
8 - y = 5
8 - ? = 5 → ? = 3
So,
y = 3
6.
y - 3 = 2
Add 3 to both sides: y = 2 + 3 →
y = 5
7.
y - 7 = 2
Add 7 to both sides: y = 2 + 7 →
y = 9
8.
8 - y = 2
8 - ? = 2 → ? = 6
So,
y = 6
9.
6 - y = 4
6 - ? = 4 → ? = 2
So,
y = 2
10.
y - 1 = 3
Add 1 to both sides: y = 3 + 1 →
y = 4
11.
y - 5 = 4
Add 5 to both sides: y = 4 + 5 →
y = 9
12.
y - 3 = 1
Add 3 to both sides: y = 1 + 3 →
y = 4
13.
y - 1 = 1
Add 1 to both sides: y = 1 + 1 →
y = 2
14.
9 - y = 6
9 - ? = 6 → ? = 3
So,
y = 3
15.
y - 2 = 1
Add 2 to both sides: y = 1 + 2 →
y = 3
16.
8 - y = 5
Same as #5 →
y = 3
17.
y - 3 = 1
Same as #12 →
y = 4
18.
8 - y = 6
8 - ? = 6 → ? = 2
So,
y = 2
19.
6 - y = 4
Same as #9 →
y = 2
20.
y - 6 = 3
Add 6 to both sides: y = 3 + 6 →
y = 9
21.
y - 2 = 7
Add 2 to both sides: y = 7 + 2 →
y = 9
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Final Answer:
1. y = 5
2. y = 4
3. y = 9
4. y = 2
5. y = 3
6. y = 5
7. y = 9
8. y = 6
9. y = 2
10. y = 4
11. y = 9
12. y = 4
13. y = 2
14. y = 3
15. y = 3
16. y = 3
17. y = 4
18. y = 2
19. y = 2
20. y = 9
21. y = 9
Parent Tip: Review the logic above to help your child master the concept of pre algebra worksheets for 8th graders.
