Use Cramer’s rule to solve the linear system.$4x+3y=5\ \ $4x+3y=5 $3x+2y=4$3x+2y=4Solution: (, )
Question
Use Cramer’s rule to solve the linear system.4x+3y=5 3x+2y=4Solution: (, )
Solution
Cramer's rule is a method used to solve systems of linear equations by expressing the solutions in terms of determinants. Here's how you can use it to solve the given system of equations:
The system of equations is:
4x + 3y = 5 3x + 2y = 4
First, we form the coefficient matrix A and the constant matrix B:
A = | 4 3 | | 3 2 |
B = | 5 | | 4 |
Next, we calculate the determinant of A, denoted as |A|:
|A| = (42) - (33) = 8 - 9 = -1
Now, we form two new matrices by replacing each column of A with B, one at a time, and calculate their determinants:
A1 = | 5 3 | | 4 2 |
|A1| = (52) - (43) = 10 - 12 = -2
A2 = | 4 5 | | 3 4 |
|A2| = (44) - (35) = 16 - 15 = 1
Finally, we find the solutions x and y by dividing the determinants of the new matrices by the determinant of A:
x = |A1| / |A| = -2 / -1 = 2 y = |A2| / |A| = 1 / -1 = -1
So, the solution to the system of equations is (2, -1).
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