I need help fast K12 look at picture

Answer:
k = 45
Step-by-step explanation:
k (constant of proportionality) = y / x
y = 135 and 225 and x = 3 and 5
So you do 135 / 3 which is 45
And then 225 / 5 is also 45
Therefore the constant of proportionality (k) is 45