Question

If x increases linearly, how will a-x behave (a>1)? trick

Answer 1

If x is increasing linearly then a-x will definitely increase/decrease linearly because a>1 and here is not any exponent on a which will change is increasing/decreasing rate
For example if we consider a=100 and increase x linearly suppose first 3 and then 4 and so on then a-x,as u can see will decrease linearly
same can be plotted on graph to understand better.

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Answer 2

let F(x)=a-x
for say a=z   where z>1
for x>z   F(x)=z-x<0
for x<z   F(x)=z-x>0