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The table shows the heights in inches of trees after they have been planted. Determine the equation which relates x and y.


Height In Pot, x | Height Without Pot, y

30 | 18

36 | 24

42 | 30

48 | 36


Ay = x - 6
By = x - 10
Cy = x - 12
Dy = x + 6

Verified Answer :

The answer is C. y = x - 12

Let's check all choices.
A. y = x - 6
    18 = 30 - 6
    18 = 24
INCORRECT

B. y = x - 10
    18 = 30 - 10
    18 = 20
INCORRECT

C. y = x - 12
    18 = 30 - 12
    18 = 18
CORRECT
    24 = 36 - 12
    24 = 24
CORRECT
...

D. y = x + 6
    18 = 30 + 6
    18 = 36
INCORRECT