Problema Solution
Find an equation of variation where y varies inversely as x and y = 7 when x= 8.
Answer provided by our tutors
"y varies inversely as x" means that when x increases, y decreases by the same factor.
In other words, the expression xy is constant:
xy = k
where k is the constant of variation.
Plug y = 7 and x = 8 and we find 'k':
8*7 = k
k = 56
The equation is:
xy = 56