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27 December, 04:03

4a + 2z = 10

-3a + Z = - 10

What is the value of 10a

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Answers (2)
  1. 27 December, 06:42
    0
    4a + 2z = 10

    2z = - 4a + 10

    Replace z by - 4a + 10 in the second equation

    -3a + z = - 10

    -3a + (-4a + 10) = - 10

    -7a + 10 = - 10

    -7a = - 20

    a = 7/20

    Value of 10a

    10a

    = 10 (7/20)

    = 3.5 or 7/2
  2. 27 December, 07:43
    0
    10a = 30

    Step-by-step explanation:

    By using elimination:

    4a + 2z = 10

    -2 (3a + z) = - 2 (-10)

    4a + 2z = 10

    6a - 2z = 20

    2z and - 2z cancel out

    10a = 30

    a = 3

    They are asking for 10a, so 10 (3) = 30.
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