A history teacher is writing a test worth 100 points. She uses multiple-choice questions worth 6 points each and true/false questions worth 2 points each. She wants the test to have three times as many multiple-choice questions. Let m represent the number of multiple-choice questions on the test, and met t represent the number pf true/false questions. Which system of equations can be user to find how many of each type of questions she should write?