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Solve the following system of equations: 2 x + 24 y = 4 and 10 (2x+y) = 1. Show that xy = 16.

Mathematics

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xy=16xy = 16

Step-by-step solution

12 steps

Part 1· 5 steps

Show that xy=16xy = 16

  1. Start with the given equation.

    log⁡2x+2log⁡4y=4\log_2 x + 2\log_4 y = 4
  2. Change the base of the second logarithm to base 2 using the formula log⁡ba=log⁡calog⁡cb\log_b a = \frac{\log_c a}{\log_c b}.

    log⁡4y=log⁡2ylog⁡24\log_4 y = \frac{\log_2 y}{\log_2 4}

    Since 22=42^2 = 4, we have log⁡24=2\log_2 4 = 2.

    log⁡4y=log⁡2y2\log_4 y = \frac{\log_2 y}{2}
  3. Substitute this back into the original equation.

    log⁡2x+2(log⁡2y2)=4\log_2 x + 2\left(\frac{\log_2 y}{2}\right) = 4 log⁡2x+log⁡2y=4\log_2 x + \log_2 y = 4
  4. Use the logarithm property log⁡bA+log⁡bB=log⁡b(AB)\log_b A + \log_b B = \log_b (AB).

    log⁡2(xy)=4\log_2 (xy) = 4
  5. Convert the logarithmic equation to an exponential equation using the definition log⁡bA=C  ⟺  A=bC\log_b A = C \iff A = b^C.

    xy=24xy = 2^4 xy=16xy = 16

    This completes the first part of the problem.

Part 2· 7 steps

Solve for xx and yy

We have a system of two equations:

  1. log⁡2x+2log⁡4y=4\log_2 x + 2\log_4 y = 4
  2. log⁡10(2x+y)=1\log_{10} (2x+y) = 1
  1. Use the result from Part 1 for the first equation.

    From Part 1, we know that log⁡2x+2log⁡4y=4\log_2 x + 2\log_4 y = 4 simplifies to:

    xy=16(∗)xy = 16 \quad (*)
  2. Simplify the second equation.

    log⁡10(2x+y)=1\log_{10} (2x+y) = 1

    Convert this to an exponential equation:

    2x+y=1012x+y = 10^1 2x+y=10(∗∗)2x+y = 10 \quad (**)
  3. Solve the system of equations (∗)(*) and (∗∗)(**).

    From equation (∗∗)(**), express yy in terms of xx:

    y=10−2xy = 10 - 2x
  4. Substitute this expression for yy into equation (∗)(*).

    x(10−2x)=16x(10 - 2x) = 16 10x−2x2=1610x - 2x^2 = 16
  5. Rearrange the equation into a standard quadratic form ax2+bx+c=0ax^2 + bx + c = 0.

    2x2−10x+16=02x^2 - 10x + 16 = 0

    Divide the entire equation by 2:

    x2−5x+8=0x^2 - 5x + 8 = 0
  6. Solve the quadratic equation for xx using the quadratic formula x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}.

    Here, a=1a=1, b=−5b=-5, c=8c=8.
    Calculate the discriminant Δ=b2−4ac\Delta = b^2 - 4ac:

    Δ=(−5)2−4(1)(8)\Delta = (-5)^2 - 4(1)(8) Δ=25−32\Delta = 25 - 32 Δ=−7\Delta = -7
  7. Analyze the discriminant.

    Since the discriminant Δ=−7\Delta = -7 is negative, the quadratic equation has no real solutions for xx.
    For logarithms to be defined in the real number system, their arguments (xx and yy) must be positive real numbers. Since there are no real values for xx, there are no real values for yy either.

    Therefore, there are no real solutions for xx and yy that satisfy the given system of equations.

    The problem has no real solutions for xx and yy.

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