Remember the steps for D: column trick, then plug and chug.
Remember the steps for other determinants: remove the variables you're solving for, replace them with = values, column trick, then plug and chug.

Answer

Example 2

Now find D for the following.

Hint

Remember the steps for D: column trick, then plug and chug.
Remember the steps for other determinants: remove the variables you're solving for, replace them with = values, column trick, then plug and chug.