You work 40 hours per week and make 13$ per hour, so multiply 40 and 13 and you get how much you make a week. Then find out what 10% of that number you got is and you get your answer.
You form both equations into one equation and solve for x. Then you would add in the value and solve. The like PQS is equal to 180 degrees. You would first do (3x-5) + (x+1) = 180.