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Solve the equation 92y imes 2^x = 72 for x and y.

Mathematics

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Answer

x=3,y=12x=3, y=\frac{1}{2}

Step-by-step solution

5 steps
  1. Express all numbers in the equation as powers of their prime factors.

    The given equation is 92y×2x=729^{2y} \times 2^x = 72.
    We can write 9 as 323^2.
    We can write 72 as 8×9=23×328 \times 9 = 2^3 \times 3^2.

  2. Substitute these prime factorizations into the equation.

    (32)2y×2x=23×32(3^2)^{2y} \times 2^x = 2^3 \times 3^2
  3. Apply the power rule (am)n=amn(a^m)^n = a^{mn} to simplify the left side of the equation.

    32×2y×2x=23×323^{2 \times 2y} \times 2^x = 2^3 \times 3^2 34y×2x=23×323^{4y} \times 2^x = 2^3 \times 3^2
  4. Equate the exponents of the corresponding bases on both sides of the equation.

    For base 3:

    34y=323^{4y} = 3^2

    This implies that the exponents must be equal:

    4y=24y = 2

    For base 2:

    2x=232^x = 2^3

    This implies that the exponents must be equal:

    x=3x = 3
  5. Solve for yy.

    From 4y=24y = 2:

    y=24y = \frac{2}{4} y=12y = \frac{1}{2}

    The values of xx and yy are:

    x=3,y=12x=3, y=\frac{1}{2}
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