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| 1. | a. | -4x + 8 = 12 + 6x 10x = 4 x = 0,4 |
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| b. | 2x + 5x + 12 = x
- 10 7x + 12 = x - 10 6x = -2 x = -1/3 |
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| c. | 8x + 3x -
5 = 13 + 2x
- 8 11x - 5 = 5 + 2x 9x = 10 x = 10/9 |
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| d. | 5(x + 7) = 20
- 7x 5x + 35 = 20 - 7x 12x = -15 x= -1,25 |
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| 2. | a. | 3y + 3x =
9 - 2y + 10x 5y = 7x + 9 y = 1,4x + 1,8 |
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| b. | 10(2
- y) = 8x + 10y 20 - 10y = 8x + 10y -20y = 8x - 20 y = -0,4x + 1 |
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| c. | 5x + 3y
= 2y + 6(2x + 9) 5x + 3y = 2y + 12x + 54 y = 7x + 54 |
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| 3. | 4x - - = 7x -
2 -3x = 6 x= -2 y = 4 · -2 - 8 = -16 Snijpunt (-2, -16) |
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| 4. | a. | Het Veluwse schaap groeit het snelst want het getal voor de t (28) is het grootst | |||
| b. |
28t + 350 = 12t + 640 16t = 290 t = 18,1 Dat is in 2038 |
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| c. |
T = V + D = 28t + 350 + 12t + 640 T = 40t + 990 40t + 990 = 2000 40t = 1100 t = 27,5 Dat is in 2047 |
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© h.hofstede (h.hofstede@hogeland.nl) |
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