1. **State the problem:** Solve the system of equations by elimination. For example, consider the system:
$$\begin{cases} 2x + 3y = 8 \\ 4x - y = 2 \end{cases}$$
2. **Explain the elimination method:** The goal is to eliminate one variable by adding or subtracting the equations after multiplying them by suitable numbers.
3. **Choose a variable to eliminate:** Let's eliminate $y$. Multiply the second equation by 3 to align coefficients of $y$:
$$\begin{cases} 2x + 3y = 8 \\ 3(4x - y) = 3(2) \Rightarrow 12x - 3y = 6 \end{cases}$$
4. **Add the two equations:**
$$ (2x + 3y) + (12x - 3y) = 8 + 6 $$
$$ 2x + 3y + 12x - 3y = 14 $$
$$ (2x + 12x) + (3y - 3y) = 14 $$
$$ 14x + \cancel{0} = 14 $$
$$ 14x = 14 $$
5. **Solve for $x$:**
$$ x = \frac{14}{14} = 1 $$
6. **Substitute $x=1$ into one original equation to find $y$:** Using the first equation:
$$ 2(1) + 3y = 8 $$
$$ 2 + 3y = 8 $$
$$ 3y = 8 - 2 $$
$$ 3y = 6 $$
$$ y = \frac{6}{3} = 2 $$
7. **Final answer:**
$$ (x, y) = (1, 2) $$
This method works by making the coefficients of one variable opposites so that adding the equations cancels that variable out, allowing you to solve for the other variable easily.
System Elimination 162667
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