Show that the function of f(x) = a - x is its own inverse for all real numbers a

f(x) = a - x

y = a - x

y + x = a - x + x

y + x = a

y + x - y = a - y

x = a - y

f-¹(x) = a - x

answer: no, but if it does it's a obvious pattern.

step-by-step explanation: