Find a value of k for which the following system has only one solution: 2x+y=7, y−kx=3?
The determinant of the coefficient matrix is
[2 1]
[-k 1]
2 + k = 0
k=-2 will make the determinant 0 and the system won't have a solution.
Any other k will yield a unique solution
As long as x and y don't have exactly the same numbers in front, and both equations are in simplest form (no common factors besides 1), there will be only one solution. So k can be any number except -2.
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Verified answer
The determinant of the coefficient matrix is
[2 1]
[-k 1]
2 + k = 0
k=-2 will make the determinant 0 and the system won't have a solution.
Any other k will yield a unique solution
As long as x and y don't have exactly the same numbers in front, and both equations are in simplest form (no common factors besides 1), there will be only one solution. So k can be any number except -2.