Solve System E4E888
1. We are given the system of equations:
$$3x + 8y = 12 \quad (1)$$
$$5x + 7y = 1 \quad (2)$$
Our goal is to find the values of $x$ and $y$ that satisfy both equations simultaneously.
2. One common method to solve such systems is the **elimination method**. We aim to eliminate one variable by making the coefficients of $x$ or $y$ the same in both equations.
3. Multiply equation (1) by 5 and equation (2) by 3 to align the coefficients of $x$:
$$5 \times (3x + 8y) = 5 \times 12 \Rightarrow 15x + 40y = 60$$
$$3 \times (5x + 7y) = 3 \times 1 \Rightarrow 15x + 21y = 3$$
4. Subtract the second new equation from the first to eliminate $x$:
$$ (15x + 40y) - (15x + 21y) = 60 - 3 $$
$$ 15x - 15x + 40y - 21y = 57 $$
$$ 19y = 57 $$
5. Solve for $y$:
$$ y = \frac{57}{19} = 3 $$
6. Substitute $y=3$ back into one of the original equations, say equation (1):
$$ 3x + 8(3) = 12 $$
$$ 3x + 24 = 12 $$
$$ 3x = 12 - 24 = -12 $$
$$ x = \frac{-12}{3} = -4 $$
7. The solution to the system is the ordered pair:
$$ \boxed{(-4, 3)} $$
8. Since we found a unique solution, the system is consistent and independent.