7 & 8 together add up to 180 which all straight lines equal. 3 is the exact same value as 7 is, all you need to do to find out a problem like this is to subtract 108 from 180 and you will have your answer. But only as long as the lines are parallel!
Hey. The answer is (7,4). The change of x is -6. Divide that by two(=-3) and add it to the first x-coord and you get 7. Do the same for your y-value(change =+6/2= +3) and you'll get 4.
