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14 October, 01:23

Given that

R=3x+9y

Find y when x = 7 and R=21

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Answers (2)
  1. 14 October, 01:41
    0
    y = 0

    Step-by-step explanation:

    Given

    R = 3x + 9y, then

    21 = 3 (7) + 9y

    21 = 21 + 9y (subtract 21 from both sides)

    0 = 9y (divide both sides by 9)

    y = 0
  2. 14 October, 05:04
    0
    y=0

    Step-by-step explanation:

    R=3x+9y

    (given)

    21=3 (7) + 9y

    21=21+9y

    9y=21-21

    9y=0

    y=0
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