1. **State the problem:** Solve the system of linear equations:
$$-3x + 5y = 7$$
$$4x + 2y = -18$$
2. **Choose a method:** We will use the elimination method to solve for $x$ and $y$.
3. **Eliminate one variable:** Multiply the first equation by 2 and the second equation by 5 to align coefficients of $y$:
$$2(-3x + 5y) = 2(7) \Rightarrow -6x + 10y = 14$$
$$5(4x + 2y) = 5(-18) \Rightarrow 20x + 10y = -90$$
4. **Subtract the first new equation from the second:**
$$\cancel{20x} + 10y - (\cancel{-6x} + 10y) = -90 - 14$$
$$20x + 10y + 6x - 10y = -104$$
$$26x = -104$$
5. **Solve for $x$:**
$$x = \frac{-104}{26} = -4$$
6. **Substitute $x = -4$ into one of the original equations, for example the first:**
$$-3(-4) + 5y = 7$$
$$12 + 5y = 7$$
7. **Solve for $y$:**
$$5y = 7 - 12$$
$$5y = -5$$
$$y = \frac{-5}{5} = -1$$
**Final answer:**
$$x = -4, \quad y = -1$$
Linear Equations B0A71D
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