Question

Find the inverse function y=-5x+20

Answer 1

`y= (-1)/(5) x +4`

Explanation:

We can find the inverse function of this excercise, isolating X and then changing the variables.

`y=-5x+20\\y-20=-5x\\(y-20)/(-5) =x\\`

`(y)/(-5)-(20)/(-5)  = x\\(-1)/(5)y+(20)/(5) =x\\ (-1)/(5)y+4 =x`

And now we change the variables and we get the inverse function:

`y= (-1)/(5) x +4`