anonymous
  • anonymous
Find f-1(x) ***the -1 is an inverse function, not negative 1*** Sketch the graphs of y=f(x) and y=f-1(x) Equation is: f(x)=2x+3
Mathematics
katieb
  • katieb
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dumbcow
  • dumbcow
y = 2x +3 what is slope? what is y-intercept?
anonymous
  • anonymous
you can find the slope of the line by taking the derivitive of your function, f'(x)=2 but with out any known points i don't think there is a way to plug your findings back into a graphable line equation. unless you looking for a straight line that goes across y=2x, something to think about i guess. hope this helps a bit
amistre64
  • amistre64
the slope of a straight line is its slope :) 2

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amistre64
  • amistre64
the inverse of a function is when you transpose x and y then solve for y
anonymous
  • anonymous
yea i messed up putting the x into my y=2 equation
dumbcow
  • dumbcow
ok y-intercept is 3 so go to graph and plot point on (0,3) slope is 2 (rise/run) so from (0,3) go up 2 and over 1(2,4) repeat to get more points do the same thing for inverse funtion y=x/2 - 3/2
amistre64
  • amistre64
f(x) = y = 2x+3 f^-1(x) = x = 2y+3 f^-1(x) = y = (x-3)/2
dumbcow
  • dumbcow
y=x/2 - 3/2 start at (0,-3/2) go up 1 over 2 (2,-1/2)

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