Monday

October 20, 2014

October 20, 2014

Posted by **Betty** on Wednesday, January 14, 2009 at 11:50pm.

I need to find the inverse, and I am wonderingif the inverse is x= 2y or f-1 = x/2????

- algebra 2 -
**Chopsticks**, Thursday, January 15, 2009 at 12:38amif u have the calculator isnt the inverse buttom -1

- algebra 2 -
**Reiny**, Thursday, January 15, 2009 at 9:09amto find the inverse of a function takes 2 steps

1. interchange the x and y variables

so y = 2x becomes x = 2y

2. Solve this new equation for y

2y = x

y = x/2

so you are correct.

for linear function of the type f(x) = mx + b

it is easy to form the inverse mentally by just "reversing" the steps and operations.

e.g. y = 3x -5

the inverse would be y = (x+5)/3

for the first, after picking any x,

we multiplied by 3 then subtracted 5

for the second, after picking any x,

we added 5 and then divided by 3

notice that not only did we perform the inverse operations, but we also performed those inverse operations in reverse order.

**Answer this Question**

**Related Questions**

Algebra - what is the inverse of the linear parent function? How would you graph...

inverse - find f^-1 (x). (this is asking me to find the inverse) f(x) = -(x-2)^2...

algebra 2 - for each function, find an equasion for the inverse. then use ...

algebra - 1 (a) A function passes through the points (0, -5), (1, 0), (2, 7). ...

College Algebra - Find the inverse of the function below. Graph the function ...

Algebra 2 - formula for converting celcius to fahrenheit: F=9/5C+32 a) what is ...

calculus - f(x)=sqrt(x-2) what is the inverse of f? I got inverse f(x)= x^2+2 ...

Algebra Help Inverse One-to-one - I need to know if I have done this correctly. ...

pre calculus - Find the inverse of the function below. Graph the function below ...

Algebra - How do you find the inverse of functions? for example how would you ...