5a + 4b = 31 5a + 6b = 39 What is a and what is b

Question

5a + 4b = 31
5a + 6b = 39
What is a and what is b

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Eirian 4 years 2021-08-16T20:37:07+00:00 1 Answers 18 views 0

Answers ( )

  1. Orla
    0
    2021-08-16T20:38:30+00:00
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    Answer:

    a = 3 and b = 4

    Step-by-step explanation:

    5a + 4b = 31 –(1)

    5a + 6b = 39 –(2)

    (2) – (1) : 2b = 8

                   b = 4 — (3)

    Substituting (3) into (1),

    5a + 16 = 31

    5a = 15

    a = 3 — (4)

    Therefore, a = 3 and b = 4

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