Let's solve each equation step by step. We'll isolate the variable $ x $ in each case using algebraic operations.
---
1. $ 3x + 3 = 57 $
Subtract 3 from both sides:
$$
3x = 57 - 3 = 54
$$
Divide both sides by 3:
$$
x = \frac{54}{3} = 18
$$
✔ Answer: $ x = 18 $
---
2. $ x \div 4 + 10 = 21 $
Subtract 10 from both sides:
$$
\frac{x}{4} = 21 - 10 = 11
$$
Multiply both sides by 4:
$$
x = 11 \times 4 = 44
$$
✔ Answer: $ x = 44 $
---
3. $ 3x - 2 = 4 $
Add 2 to both sides:
$$
3x = 4 + 2 = 6
$$
Divide both sides by 3:
$$
x = \frac{6}{3} = 2
$$
✔ Answer: $ x = 2 $
---
4. $ x \div 11 + 12 = 22 $
Subtract 12 from both sides:
$$
\frac{x}{11} = 22 - 12 = 10
$$
Multiply both sides by 11:
$$
x = 10 \times 11 = 110
$$
✔ Answer: $ x = 110 $
---
5. $ 9x + 1 = 100 $
Subtract 1 from both sides:
$$
9x = 100 - 1 = 99
$$
Divide both sides by 9:
$$
x = \frac{99}{9} = 11
$$
✔ Answer: $ x = 11 $
---
6. $ 7x - 16 = 68 $
Add 16 to both sides:
$$
7x = 68 + 16 = 84
$$
Divide both sides by 7:
$$
x = \frac{84}{7} = 12
$$
✔ Answer: $ x = 12 $
---
7. $ x \div 6 + 18 = 22 $
Subtract 18 from both sides:
$$
\frac{x}{6} = 22 - 18 = 4
$$
Multiply both sides by 6:
$$
x = 4 \times 6 = 24
$$
✔ Answer: $ x = 24 $
---
8. $ x \div 11 - 1 = 10 $
Add 1 to both sides:
$$
\frac{x}{11} = 10 + 1 = 11
$$
Multiply both sides by 11:
$$
x = 11 \times 11 = 121
$$
✔ Answer: $ x = 121 $
---
9. $ x \div 9 + 13 = 20 $
Subtract 13 from both sides:
$$
\frac{x}{9} = 20 - 13 = 7
$$
Multiply both sides by 9:
$$
x = 7 \times 9 = 63
$$
✔ Answer: $ x = 63 $
---
10. $ 2x - 1 = 19 $
Add 1 to both sides:
$$
2x = 19 + 1 = 20
$$
Divide both sides by 2:
$$
x = \frac{20}{2} = 10
$$
✔ Answer: $ x = 10 $
---
✔ Final Answers:
| Equation | Solution |
|--------|---------|
| $ 3x + 3 = 57 $ | $ x = 18 $ |
| $ x \div 4 + 10 = 21 $ | $ x = 44 $ |
| $ 3x - 2 = 4 $ | $ x = 2 $ |
| $ x \div 11 + 12 = 22 $ | $ x = 110 $ |
| $ 9x + 1 = 100 $ | $ x = 11 $ |
| $ 7x - 16 = 68 $ | $ x = 12 $ |
| $ x \div 6 + 18 = 22 $ | $ x = 24 $ |
| $ x \div 11 - 1 = 10 $ | $ x = 121 $ |
| $ x \div 9 + 13 = 20 $ | $ x = 63 $ |
| $ 2x - 1 = 19 $ | $ x = 10 $ |
---
🔍 Summary of Strategy:
To solve for $ x $, we use
inverse operations:
- Undo addition/subtraction first.
- Then undo multiplication/division.
- Always perform the same operation on both sides to keep the equation balanced.
Let me know if you'd like these steps written out neatly for a worksheet!
Parent Tip: Review the logic above to help your child master the concept of worksheet on two step equations.