How can you use number patterns to find the least common multiple of 120 and 360

Use the knowledge of x- and y- intercepts to choose the correct graph of the equation 3x+6y=6

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

How do you solving the solution of each system using elimination?