Fifteen is six more than two times a number

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

How do you use the elimination method for this question? explain, because i really want to understand!

Darren earned $663.26 in net pay for working 38 hours. he paid $118.51 in federal and state income taxes, and $64.75 in fica taxes. what was darren's hourly wage? question options: $17.45 $19.16 $20.57 $22.28