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23 July, 21:20

Two equations are given below:

a - 3b = 9

a = b - 3

What is the solution to the set of equations in the form (a, b) ?

(-9, - 6)

(-4, - 3)

(-6, - 3)

(-9, - 7)

+5
Answers (1)
  1. 23 July, 21:30
    0
    A - 3b = 9

    a = 9 + 3b

    therefore eq. 1 equals eq. 2 (a = b - 3)

    b - 3 = 9 + 3b

    b - 3b = 9 + 3

    -2b = 12

    b = - 6 (Answer)

    by substituting b in eq. 2

    a = b - 3

    a = - 6 - 3

    a = - 9 (Answer)

    (a, b)

    (-9,-6)
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