In solving systems of linear equations, the elimination method offers a systematic approach to simplify the process by eliminating one variable through addition. This method is particularly effective when equations are already in standard form, allowing for straightforward alignment of coefficients. The goal is to manipulate the equations so that when added together, one variable cancels out, making it easier to solve for the remaining variable.
To illustrate, consider the equations:
1. \(3x + 2y = 1\)
2. \(-x + y = 3\)
First, ensure both equations are in standard form, aligning the coefficients of \(x\), \(y\), and the constants. If direct addition does not eliminate a variable, you may need to multiply one or both equations by a suitable number to create equal and opposite coefficients. For instance, multiplying the second equation by 3 yields:
1. \(3x + 2y = 1\)
2. \(-3x + 3y = 9\)
Now, when you add these equations, the \(x\) terms cancel out:
\((3x - 3x) + (2y + 3y) = 1 + 9\
which simplifies to:
\(5y = 10\)
From this, you can solve for \(y\):
\(y = 2\)
Next, substitute \(y = 2\) back into one of the original equations to find \(x\). Using the second equation:
\(-x + 2 = 3\
Rearranging gives:
\(-x = 1\
Thus, \(x = -1\).
In conclusion, the solution to the system of equations is \(x = -1\) and \(y = 2\). This method not only streamlines the solving process but also reinforces the understanding of how to manipulate equations effectively. Practicing this method will enhance your problem-solving skills in algebra.