Is y=1/2x proportional

It is a proportional. It is special called direction proportional.

Step-by-step explanation:

It is a linear relationship and it is a direction proportional.

The direction proportional is in the form y = kx, where k is a constant.

If x increases/decreases, then the value of y also increases/decreases. This is called direct proportional.

Here the value of k = 1 over 2.

This is also in the linear form y = mx + b, where "m" is the slope and b is the y-intercept.

The linear equations always a direct proportional.

Yes, this is a linear equation with a constant rate of change (a slope) so the sets of values of the graph are proportional