Of course it is.....
I didn't miss anything.
"Linear" is to do with the scale factor value, which can be positive or negative, and if that scale remains constant, then the relationship is "linear". If the scaling factor changes in any way, the relationship becomes "non-linear".
Linear means "straight-line" and a straight line is produced if m is kept a constant in the scaling equation y = mx + c
If m is kept a constant, it can be positive, to give "proportional", or negative, to give "inversely proportional".
The "proportional" part of the description is the scaling, and if you don't say "inversely" y increases as x increases. When you add "inversely", y will decrease as x increases.
Proportional and Inversely Proportional are both Linear.
A linear equation is a straight line:
https://www.quora.com/Why-is-the-graph-of-a-linear-equation-always-a-straight-line
https://en.wikipedia.org/wiki/Linear_equation
Inversely proportional isn't a first order polynomial (linear equation). How do you express m in y=m*x+c for 200/x?
As Bernie said, plot 200/x and you'll see.
I got it now, you mix up proportional with a negative m and the term inversely proportional. A proportional equation with a negative m isn't not called inversely proportional. Look it up.
Inverse proportionality on wikipedia:
https://en.wikipedia.org/wiki/Proportionality_(mathematics)#Inverse_proportionality
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