Maths Homework – Week 9 BY ERIKA NGUYEN THORSEN

1. (a) (-6) x (-7) = 42 (b) -7 – 11 = -18 (c) 3 – (-8) = 11 (d) -7 + 4 = -3 (e) -9 – (-2) = -7 2. Multiply x + 2 by 3 = 3x + 6 3. Multiply 2x – 5 by 4: 2x x 4 = 8x - 20 4. Multiply x + 2 by x: x2 + 2x 5. 4x + 2 = 10 = 4 x 2 = 8 {8 + 2 = 10} x=2 6. 5x – 2 = 13 = 5x – 2+ 2 = 13 + 2 5x = 15 x=3

1. (a) 56 ÷ (-7) = -8 (b) -6 – (-19) = 13 (c) -16 + 9 = -7 (d) -4 + (-27) = -31 2. 2x – 3 by 7: 14x - 21 3. 4x – 3 by x: 4x2 – 3x 4. 8x – 4 = 4 (2x – 1) 5. 9x + 6 = (3x + 2) 6. 9 – 2x = 5 9 – 2x + 2x = 5 + 2x 9 = 5 + 2x 9 – 5 = 5 + 2x – 5 4 = 2x 4/2 = 2x/2 x=2 7. 1x × 2x ?

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