Yes, and here's why.
When y= 2x + 3 is spread apart and broken down it can be explained like this:
y= Total value (It almost always represents a total)
2x= Slope (For example 2 plates per min where x would represent the ratio)
3= This is the Y intercept (Where the X and Y axis meet. It is also known as initial value)
So if I make this into an equation it could be shown like this:
y= 2x + 3 (The slope is 2x and represents how many flower pots someone makes in a minute, and the 3 represents 3 pots that were already made before the person started recording the data).
This is a proportional relationship because the slope will always be 2.
Hope this helps and have a nice day.
-R3TR0 Z3R0