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4 May, 06:06

Solve this equation for x in terms of y and z:

9x + 3y + 4z = 24

What is the value of x when y = 9 and z=-12?

+5
Answers (2)
  1. 4 May, 06:40
    0
    3y = 3 * 9 = 27

    4z = 4 * - 12 = - 48

    : - 48 + 27 = - 21

    : - 21 + x = 24

    : X = 45.

    I hope that makes sense.
  2. 4 May, 09:21
    0
    x = 5

    Step-by-step explanation:

    9x + 3y + 4z = 24

    9x + 3 (9) + 4 (-12) = 24

    9x + 27 + (-48) = 24

    9x + 27 - 48 = 24

    9x - 21 = 24

    9x = 24 + 21

    9x = 45

    x = 45 : 9

    x = 5
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