Question

18. Find the inverse of {(4, -1), (3, -2), (6, 9), (8, 5)}.

Answer 1

An inverse function will simply reverse the coordinate pairs of the original function.  If f(x)=(x,y), f^-(x)=(y,x).

So 18 is H

...

If f(x)=y=3x-4, to find the inverse function, solve for x, and then reverse the labels as seen below...

y=3x-4

y+4=3x

(y+4)/3=x so the inverse function is:

y=(x+4)/3