2)

b) prove that if there is f which gets a unique value for each x and continues in R ,

then f monotonickly increasing in R.

i tried like this:

monotonickly increasing is when for every x>y then f(x)>f(y).

suppose there is 't' in R

we can choose M>y

by the limit definition for x>M f(x)>N=|t|+1>t

if we say that t=f(y)

the we get the f(x)>f(y) which is the definition we need to proove

is it correct

?