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24 July, 10:52

2a - 4c = 20

-3a+b-4c=20

- 4a + 2b + 3c = - 15

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Answers (2)
  1. 24 July, 10:53
    0
    Answer: 15-9a+b+3c

    Step-by-step explanation:

    ~ 2a-4c = 20-3a+b-4c = 20-4a+2b+3c = - 15

    ~ 20-5a+b=20-4a+2b+3c=-15

    ~ - 9a+b+3c = - 15

    ~ 15-9a+b+3c
  2. 24 July, 10:59
    0
    Answer: 15-9a+b+3c

    Step-by-step explanation:

    ~ 2a-4c = 20-3a+b-4c = 20-4a+2b+3c = - 15

    ~ 20-5a+b=20-4a+2b+3c=-15

    ~ - 9a+b+3c = - 15

    ~ 15-9a+b+3c
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