The problem asks us to find the values of $x$ and $y$ given the following two equations: $\log_2(3x+y) = 1$ $\log_2(\frac{x}{y}) = -2$

AlgebraLogarithmsSystems of EquationsLinear EquationsSubstitution
2025/4/8

1. Problem Description

The problem asks us to find the values of xx and yy given the following two equations:
log2(3x+y)=1\log_2(3x+y) = 1
log2(xy)=2\log_2(\frac{x}{y}) = -2

2. Solution Steps

First, we can rewrite the logarithmic equations in exponential form.
For the first equation, log2(3x+y)=1\log_2(3x+y) = 1, we have:
3x+y=213x + y = 2^1
3x+y=23x + y = 2
For the second equation, log2(xy)=2\log_2(\frac{x}{y}) = -2, we have:
xy=22\frac{x}{y} = 2^{-2}
xy=122\frac{x}{y} = \frac{1}{2^2}
xy=14\frac{x}{y} = \frac{1}{4}
x=14yx = \frac{1}{4}y
Now we have a system of two linear equations with two variables:
3x+y=23x + y = 2
x=14yx = \frac{1}{4}y
We can substitute the second equation into the first equation:
3(14y)+y=23(\frac{1}{4}y) + y = 2
34y+y=2\frac{3}{4}y + y = 2
34y+44y=2\frac{3}{4}y + \frac{4}{4}y = 2
74y=2\frac{7}{4}y = 2
y=247y = 2 \cdot \frac{4}{7}
y=87y = \frac{8}{7}
Now we can substitute the value of yy back into the equation x=14yx = \frac{1}{4}y:
x=1487x = \frac{1}{4} \cdot \frac{8}{7}
x=828x = \frac{8}{28}
x=27x = \frac{2}{7}

3. Final Answer

x=27x = \frac{2}{7}
y=87y = \frac{8}{7}

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