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30 December, 16:43

What is the value of 3ab+5b-6 when a=-1 and b=3?

A. 0

B. 6

C. 18

D. 24

+5
Answers (2)
  1. 30 December, 19:00
    0
    A. 0

    Step-by-step explanation:

    3ab+5b-6

    = 3 (-1) (3) + 5 (3) - 6

    =3 (-3) + 15-6

    =-9+9

    =0 (you have to subtract because they don't have the same signs)
  2. 30 December, 20:21
    0
    use the substitution method

    3ab+5b-6

    3 (-1) (3) + 5 (3) - 6

    Mutiply 3 (-1) (3) first

    3 (-1) (3) = - 3*3 = - 9

    -9+5 (3) - 6

    then mutiply

    5 (3) = 15

    -9+15-6

    = 6-6

    = 0

    Answer : A. 0
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