Solve Linear System 2D1706
1. **State the problem:** Solve the system of linear equations:
$$4x - 5y = -3$$
$$14x + 2y = 9$$
2. **Formula and method:** We can use the method of elimination or substitution to solve for $x$ and $y$. Here, we'll use elimination.
3. **Elimination step:** Multiply the first equation by 2 and the second equation by 5 to align coefficients of $y$:
$$2(4x - 5y) = 2(-3) \Rightarrow 8x - 10y = -6$$
$$5(14x + 2y) = 5(9) \Rightarrow 70x + 10y = 45$$
4. **Add the two equations:**
$$8x - 10y + 70x + 10y = -6 + 45$$
$$78x = 39$$
5. **Solve for $x$:**
$$x = \frac{39}{78} = \frac{1}{2}$$
6. **Substitute $x = \frac{1}{2}$ into the first original equation:**
$$4\left(\frac{1}{2}\right) - 5y = -3$$
$$2 - 5y = -3$$
7. **Solve for $y$:**
$$-5y = -3 - 2 = -5$$
$$y = \frac{-5}{-5} = 1$$
**Final answer:**
$$x = \frac{1}{2}, \quad y = 1$$