Question

The number of solutions of the system of the system of equations x + 2y + z = 3, 2x + 3y + z = 3, 3x + 5y + 2z = 1 is _____________.

Answer 1

The given system of equations is x + 2y + z = 3, 2x + 3y + z = 3 and 3x + 5y + 2z = 1.

$∆=\left|\begin{array}{ccc}1& 2& 1\\ 2& 3& 1\\ 3& 5& 2\end{array}\right|=1\left(6-5\right)-2\left(4-3\right)+1\left(4-3\right)=1-2+1=0$

${∆}_x=\left|\begin{array}{ccc}3& 2& 1\\ 3& 3& 1\\ 1& 5& 2\end{array}\right|=3\left(6-5\right)-2\left(6-1\right)+1\left(15-3\right)=3-10+12=5\ne 0$

Here, $∆=0$ and at least one of ${∆}_x,{∆}_y$ and ${∆}_z$ is not zero, so the given system of equations has no solution.

Thus, the given system of equations has no solution.

The number of solutions of the system of the system of equations x + 2y + z = 3, 2x + 3y + z = 3, 3x + 5y + 2z = 1 is ___0___.