Lets observe:
We have two points
(20, 10) and (30, 15)
What it show us?
When x = 20, y = 10
When x = 30, y = 15
As you can see, we have to go 10 in x to have 5 in y, so that means y is even half of x
So the proportion is 1/2 between y and x
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