Plant a is 18 inches tall after one week,36 inches tall after two weeks ,56 inches tall after three weeks. plant b is 18 inches tall after one week , 36 inches tall after two weeks, 54 inches tall after three weeks. which situation represents a proportional relationship between the plants height and number of weeks?

There are 2 given situations:
Plant A and Plant B growing in 3 weeks. Find which plant grows proportional
Plant A
=> 1st week = 18 inches
=> 2nd week = 36 inches
=> 3rd week = 56 inches
=> 18 + 18 = 36 + 20 = 56
Thus, this is not proportional
Plant B
=> 1st week = 18 inches
=> 2nd week = 36 inches
=> 3rd week  = 54 inches
=> 18 + 18 = 36 + 18 = 54 inches
thus, the growth of this plant is proportional