Pregunta
Solve this system of cquations: \( \left\{\begin{array}{l}3 x-2 y=-8 \\ y=\frac{3}{2} x-2\end{array}\right. \)
Ask by Marsh Gonzalez. in the United States
Jan 24,2025
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Respuesta verificada por el tutor
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There is no solution to the system because the equations represent parallel lines that never intersect.
Solución
To solve the given system of equations:
\[
\begin{cases}
3x - 2y = -8 \\
y = \dfrac{3}{2}x - 2
\end{cases}
\]
we can use the **substitution method**. Here's a step-by-step solution:
### Step 1: Substitute \( y \) from the Second Equation into the First
From the second equation:
\[
y = \dfrac{3}{2}x - 2
\]
Substitute this expression for \( y \) into the first equation:
\[
3x - 2\left(\dfrac{3}{2}x - 2\right) = -8
\]
### Step 2: Simplify the Equation
Expand the terms:
\[
3x - 2 \times \dfrac{3}{2}x + 2 \times 2 = -8
\]
\[
3x - 3x + 4 = -8
\]
### Step 3: Combine Like Terms
Combine the \( x \)-terms:
\[
0x + 4 = -8
\]
\[
4 = -8
\]
### Step 4: Analyze the Result
The equation \( 4 = -8 \) is a **contradiction**; it is never true. This means that there is no value of \( x \) and \( y \) that simultaneously satisfies both equations.
### Conclusion
**The system of equations has no solution.** This is because the two equations represent parallel lines with the same slope but different y-intercepts, meaning they never intersect.
**Final Answer:**
There is no solution to the system because the equations describe parallel lines.
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Extra Insights
To solve the system of equations, we can substitute the expression for \(y\) from the second equation into the first equation. 1. Substitute \(y = \frac{3}{2} x - 2\) into \(3x - 2y = -8\): \(3x - 2\left(\frac{3}{2}x - 2\right) = -8\) 2. Distribute the -2: \(3x - 3x + 4 = -8\) 3. This simplifies to: \(4 = -8\) Since this is a contradiction, it indicates that there is no solution to this system of equations. The two lines represented by these equations are parallel and never intersect. Hence, the system is inconsistent!
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