For this problem work backwards. Start from 17 and add 14. You should get 31. Then subtract 12, which equals 19. Finally add 11 to 19, which equals 30. Basically you are doing the inverse operation to get your answer. Hope this helps!
C Y=X+9 9 is called y intercept that's where pt starts The number is front of X is called slope if no number it's 1 so it's 1/1 one up and one right up positive right positive start from 9