Jawaban:

1. B. 4x - 4

2. C. x - 3y - 1

3. C. 8x + 10y

4. C. p + 3q - 8r + 22

5. C/D. 21x - 6

6. -7 (tidak ada jawaban yg benar)

7. 7x - 1 (tidak ada jawaban yg benar)

8. 6a + 2b - 4 (tidak ada jawaban yg benar)

9. B. 60m²

10. 4x + 4y + 2 (tidak ada jawaban yg benar)

Penjelasan dengan langkah-langkah:

1.

7x + 2 - 3x - 6

= 7x - 3x + 2 - 6

= 4x - 4

2.

9 - 3y + 2 + x - 12

= x - 3y + 9 + 2 - 12

= x - 3y - 1

3.

a = 4x + 2y

b = 4x + 8y

a + b = 4x + 2y + 4x + 8y

= 4x + 4x + 2y + 8y

= 8x + 10y

4.

(3p - 3q + 5) + (6q + r + 7) - (2p + 9r - 10)

= 3p - 2p - 3q + 6q + r - 9r + 5 + 7 + 10

= p + 3q - 8r + 22

5.

3(7x - 2)

= 21x - 6

6.

a = -2, b = 1

3a + 2b - 3

= 3(-2) + 2(1) -3

= -6 + 2 - 3

= -4 - 3

= -7

7.

3(x - 3) + 4(x + 2)

= 3x - 9 + 4x + 8

= 3x + 4x - 9 + 8

= 7x - 1

8.

2(a - 3b + 4) + 4(a + 2b - 3)

= 2a - 6b + 8 + 4a + 8b - 12

= 2a + 4a - 6b + 8b + 8 - 12

= 6a + 2b - 4

9.

x = 8

p = x + 4

p = 8 + 4

p = 12

l = x - 3

l = 8 - 3

l = 5

L = p × l

= 12 × 5

= 60m²

10.

s1 = x + 3y

s2 = x + 2y - 2

s3 = 2x - y + 4

K = s1 + s2 + s3

= x + 3y + x + 2y - 2 + 2x - y + 4

= x + x + 2x + 3y + 2y - y - 2 + 4

= 4x + 4y + 2