Posted by Sara on Wednesday, January 11, 2012 at 9:10am.
just plug and chug:
(I rewrite 2/5x as 2x/5 to avoid ambiguity)
f(g) = 6 - 2g/5 = 6 - 2(15 - 5x/2)/5
= 6 - (30 - 5x)/5 = 6 - (6 - x) = x
g(f) = 15 - 5f/2 = 15 - 5(6 - 2x/5)/2
= 15 - (30 - 2x)/2 = 15 - (15 - x) = x
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