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Year 7 Algebra Worksheet

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Year 7 Algebra Worksheet worksheet preview

Year 7 Algebra Worksheet

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📚 Part 1: Multiple Choice

1. Simplify: 3x + 4x = ?

7x

12x

x + 7

2. Substitute x = 2 into 4x − 3. What is the result?

5

8

1

3. Expand: 2(x + 3) = ?

2x + 6

2x + 3

x + 6

4. Check all that apply: Which of the following are linear equations?

2x + 3 = 7

x^2 + 2 = 0

3y − 5 = 0

xy = 6

✏️ Part 2: Short Answers & Working

5. Solve: 2x + 5 = 17. Show working.
6. Form an expression: Sam runs r kilometres each run and does 3 runs per week. Write an expression for the total distance Sam runs in 4 weeks.
7. Evaluate: 5a − 2b for a = 3 and b = 4. Show working.
8. Solve: 3(x − 2) = 9. Show working.
9. Translate and solve: "Seven more than twice a number n is 19." Write the equation and find n.

✅ Answers & Worked Demonstrations

1. Answer: 7x

Demonstration: 3x + 4x = (3 + 4)x = 7x.

2. Answer: 5

Demonstration: 4x − 3 with x = 2 → 4(2) − 3 = 8 − 3 = 5.

3. Answer: 2x + 6

Demonstration: 2(x + 3) = 2×x + 2×3 = 2x + 6.

4. Answers: 2x + 3 = 7 (yes); 3y − 5 = 0 (yes)

Demonstration: Linear equations have variables to the power of 1 and no products of variables. x^2 + 2 is quadratic; xy = 6 is not linear.

5. Answer: x = 6

Demonstration: 2x + 5 = 17 → 2x = 12 → x = 6.

6. Answer: 12r

Demonstration: 3 runs per week × r km per run = 3r km per week. Over 4 weeks: 4 × 3r = 12r.

7. Answer: 7

Demonstration: 5a − 2b = 5(3) − 2(4) = 15 − 8 = 7.

8. Answer: x = 5

Demonstration: 3(x − 2) = 9 → x − 2 = 3 → x = 5.

9. Answer: 2n + 7 = 19, n = 6

Demonstration: 2n + 7 = 19 → 2n = 12 → n = 6.

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