Answer
$-1+(-6)=-7$
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \curvearrowleft\!\curvearrowleft\!\curvearrowleft\!\curvearrowleft\!\curvearrowleft\!\curvearrowleft$
$\overleftarrow{\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ |\ \ }$
${\ \ \ -1\ \ \ \ \ \ \ \ -5\ \ \ \ \ \ -1 \ 0}$
${\ \ \ \ \ \ \ \ 0}$
Work Step by Step
To add -6 count 6 spaces to the left on the number line, starting at -1.