Pat = p, Zach = z p = 6 + 2z... 2z = p - 6... z = (p-6)/2 p + z < 36 (6 + 2z) + z < 36 3z + 6 < 36 2z < 30 z < 15 So the greatest age for z Zach that is less than 15 is 14! 14 years old
To get no solution you need to have 2 sides of the equations that don't match. If you go through B you will end up getting 3x- (11/7)=3x-2 which is not true.