Use determinants to determine if the matrix below is singular.

$A=$	$\left.\vphantom{\begin{array}{c}\!\strut\\\!\strut\\\!\strut\\\end{array}}\right[$ -6 -6 $\left.\vphantom{\begin{array}{c}\!\strut\\\!\strut\\\!\strut\\\end{array}}\right]$ 5 1

$\det\,(A)= \ $

Is $A$ singular? Type "yes" or "no":