Chap 5 Algebra... Different "Faces" of Algebra (II)

The total length of 4 roads is (3x - 1) km. What are the possible lengths of the 4 roads in kilometres?

e.g. The length of the 4 roads are: x km, x km, x-7 km, 6 km
Check: x + x + (x - 7) + 6 = 3x - 1

33 comments:

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  5. The length of the 4 roads are: x - 1 km, x - 2 km, x-3 km, 5 km

    Check: (x-1) + (x-2) + (x-3) + 5 = 3x - 1

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  8. 0.5x km, 0.5x km, 0.5x km, 1.5x-1km

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  9. 3x-1 = x + x + {(x-1)÷2} + {(x-1)÷2}

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  13. x + x + (x-4) + 3km = 3x-1 km

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  14. road 1: x km road 2: x km road 3: x km road 4:x+1-x km

    check: x+x+x+x+1-x= 3x-1km

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  15. x km + x km + (x-9) km + 8 km

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  17. Please refer to the hardcopy with feedback on the class notice board.

    Just to pick a few from the above...

    1. Kai Check:
    Among the 4 lengths, one of them is negative? Check again.

    2. Bryan:
    The sum of lengths you gave was 3x + 10 - 12 + 1
    Are you implying the 4 lengths are 3x, 10, -12 and 1? Then one of them is negative. Check again.

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