fx=5x1 / 9
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If f(x)=(5x-1)/9 Then the inverse is x=(5y-1)/9 9x=5y-1 9x+1=5y (9x+1)/5=y The inverse is f(x)=(9x+1)/5
If: 5x/10 = 2 then the value of x works out as 4
Multiply the bottom equation by -1
It is: y = -1/5x-2
y = 5x + 9