1. The problem is to solve a system of simultaneous linear equations.
2. The general form of simultaneous linear equations is:
$$\begin{cases} ax + by = c \\ dx + ey = f \end{cases}$$
where $a,b,c,d,e,f$ are constants.
3. To solve, we can use substitution or elimination methods. Here, we use elimination:
4. Multiply the first equation by $e$ and the second by $b$ to align coefficients of $y$:
$$e(ax + by) = ec \Rightarrow aex + bey = ec$$
$$b(dx + ey) = bf \Rightarrow bdx + bey = bf$$
5. Subtract the second from the first:
$$aex + bey - (bdx + bey) = ec - bf$$
$$aex - bdx = ec - bf$$
6. Factor $x$:
$$x(ae - bd) = ec - bf$$
7. Solve for $x$:
$$x = \frac{ec - bf}{ae - bd}$$
8. Substitute $x$ back into one of the original equations to find $y$.
This method finds the unique solution $(x,y)$ if $ae - bd \neq 0$.
Final answer: $$x = \frac{ec - bf}{ae - bd}, \quad y = \frac{af - dc}{ae - bd}$$ where $y$ is found similarly by elimination.
Simultaneous Equations A9B250
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