Answer:
k = 4
Step-by-step explanation:
The constant of proportionality is found by starting with y = kx, then finding k.
We can just use one point (such as the first one, (1,4) ) and substitute these values of x and y into the equation y = kx, to get:
4 = k x1
k = 4.
So y = 4x
(we can also check that all the other points also satisfy this equation - which they do, as each y value is 4 times the corresponding x value)
