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23 May, 21:34

Which ordered pair in the form (a, b) is a solution of this equation?

3a - 4b = 21

A.

(-2, - 3)

B.

(0, 7)

C.

(-3, - 2)

D.

(7, 0)

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Answers (1)
  1. 24 May, 01:02
    0
    3a - 4b = 21

    check (-2, - 3)

    3 (-2) - 4 (-3) = 21

    -6 + 12 = 21

    6 does not = 21 so NO

    check (0, 7)

    3 (0) - 4 (7) = 21

    0-28=21

    -28 does not equal 21 so NO

    check (-3, - 2)

    3 (-3) - 4 (-2) = 21

    -9 + 8 = 21

    1 does not = 21 so NO

    check (7, 0)

    3 (7) - 4 (0) = 21

    21 = 21

    Choice D
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