00:01
Hey guys, so we're looking for the inverse function of 1 minus 3x, right? so there are three steps to do so.
00:07
First of all, let's interchange x and y here.
00:10
So we'll then have x equals 1 minus 3y, right? and then we need to solve a y.
00:17
So we'll then have 1 minus x equals 3y.
00:25
So y would then be 1 minus x divided by 3.
00:31
Okay, so to verify that this is indeed an inverse function, we need to do f of inverse fx and inverse f x.
00:43
Okay, so for the initial function 1 minus 3x, we're not going to input x here, we're going to input the supposedly inverse function, which is 1 minus x divided by 3 year and simplify it.
01:03
Then this should be 1 minus 1 plus x which is x do the same thing down here okay so the inverse function was 1 minus x divided by 3 right but instead of putting x in here we're going to input the f of x which is 1 minus 3x like this right simplify here and then we'll also get x2 so because both of these functions give us x then we have successfully verified that we have found the inverse function of x okay so when we're talking about the inverse function there are no restrictions on either x or y right so then the domain and ring here which is going to be r for all real numbers okay so part c of the question asked to graph everything.
02:06
Okay, so i've already graphed the line y equals x here...