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9 March, 07:50

Two equations are given below:

a - 3b = 4

a = b - 2

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

(-2, - 2)

(-3, - 1)

(-9, - 7)

(-5, - 3)

+4
Answers (1)
  1. 9 March, 10:24
    0
    Since the second equation gives a value for a, we can substitute it into the other equation to find a value for B.

    Let's substitute b-2 into the first equation wherever there is an a.

    a - 3b = 4

    (b-2) - 3b = 4

    b - 2 - 3b = 4

    -2 - 2b = 4

    -2b = 6

    b = - 3

    Now let's find a by substituting - 3 into either of the equations to find the value of a.

    a = b - 2

    a = - 3 - 2

    a = - 5

    So your solution set is (-5, - 3)
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