Great question, but can't give you an answer without the first part of the problem.
Just by looking at 14 it will be non linear since any equation that has an exponent will automatically be non linear and will not form a straight line. 13 would be linear as when you subtract x from both sides you’ll have a straight line meaning it’s linear. And 12 will be linear because the equation once into y=mx+b format it will be y=-2x/3+7/3 making a straight line if graphed correctly.
Jose is right
Evan's last calculation should have been 2 (-1/8) because 6 - 7 = -1
