6y-x you have to plug in the numbers for x and y so it would be (6x4)-6 then you you solve this you do whats in parentheses first. Your problem should look like this 24-6 then you subtract that and you get 18. 18 will be your final answer.
Since you that that line is 180 degrees you can simply do 180-149 and find that the answer is 31 degrees. So you would do 13x+5=31, 31-5=26, 26/13, and then x=2 :)
