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7 February, 22:41

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

3a - 4b = 21

A.

(-3, - 2)

B.

(-2, - 3)

C.

(0, 7)

D.

(7, 0)

+2
Answers (2)
  1. 7 February, 23:00
    0
    Answer is D (7, 0)
  2. 7 February, 23:02
    0
    D. (7,0)

    Step-by-step explanation:

    Our original equation is 3a-4b=21.

    The one we will try first is D. (7, 0)

    Since we need to plug it in the form of (a, b) here is the equation now:

    3 (7) - 4 (0) = 21

    Now we solve:

    3*7=21

    4*0=0

    Now we have 21-0=21

    21-0 does equal 21.
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