Answer:
y = 3x
Step-by-step explanation:
Note the values of y are 3 times the corresponding values of x, that is
x = 4 → y = 4 × 3 = 12
x = 7 → y = 7 × 3 = 21
x = 10 → y = 10 × 3 = 30
x = 13 → y = 13 × 3 = 39
Thus the equation describing the proportion is
y = 3x
