solve for the missing side,x.

Answer:
x = 9
y = 14
Step-by-step explanation:
If we observe the two figures, the bigger one is increased by 1.5 because 12/9 = 1.5.
Smaller side = 6
Larger side = x
=> 6 x 1.5
=> x = 9
Smaller side = y
Larger side = 21
=> 21 / 1.5
=> y = 14