Answer:
1
Explanation:
The equation of the following line looks like this:

In this type of line, every single y value corresponds to the given x value. The slope of this line is considered to be positive one, as you can multiply x by one and still get the same number (Identity property)
A constant of proportionality originates from this type of equation:

K is the constant, and the number multiplied by x. It can also be recognized as the slope (m)
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