23basu3
23.05.2020 •
Mathematics
Multi-step Function Inverses (Level 1)
For the function f(x)=9 (x-8), find f^-1 (x)
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Ответ:
Option 1
Step-by-step explanation:
y = 9(x - 8)
Make x the subject
y/9 + 8 = x
Interswitch variables
f^-1(x) = x/9 + 8
Ответ:
x + y = 21 and then
5x + 2y = 66
Multiply the top equation by two and subtract from the bottom one...
5x + 2y = 66
-(2x + 2y = 42)
and we get
3x = 24
x = 8
y = 21-x = 13