defence exam Agniveer Navy MR Mock Test Series 2025 Quantitative Aptitude Algebra Linear Equation in 2 Variable
If the system of equations 7x + ky = 27 and kx + 7y = 19 have unique solution, then which one of the following is correct ?
1
k ≠ 7
2
k ≠ 13
3
k = 7
4
k = 13