Use number line and add the following integers:

 $9+\left(-6\right)$

Use number line and add the following integers:

$\left(-1\right)+\left(-7\right)$

Add the following integers using the number line:

 $\left(-1\right)+\left(-2\right)+\left(-3\right)$

Use number line and add the following integers:

$\left(-2\right)+8+\left(-4\right)$

Add without using number line:

$11+\left(-7\right)$