Find the value of m if the matrix A has no inverse. how can i solve this question?

matrix A said to be singular if and only if it's determinant equal to zero. matrix A has no inverse if and only if matrix A is singular

since A has no inverse, then [tex]det(A)=0[/tex]
[tex](-10)*(1)-(-m)*(3)=0[/tex]
[tex]-10+3m=0[/tex]
[tex]m=\frac{10}{3}[/tex]