Name 3 sets of supplementary angles

Pls! does anybody know a shortcut for answering these types of questions in the future?

What is the value of x in the equation7x+2y=48 when y=3

Traffic on saturday, it took ms. torres 24 minutes to drive 20 miles from her home to her office. during friday's rush hour, it took 75 minutes to drive the same distance. a. what was ms. torres's average speed in miles per hour on saturday? b. what was her average speed in miles per hour on friday?