Problema Solution
If y varies directly with x2 and y = 448 when x = 8, find an equation to represent this relationship.
Answer provided by our tutors
y varies directly with x^2 if there is a constant k such that
y = k*x^2
where k is constant
y = 448 when x = 8
448 = k*8^2
by solving we find
k = 7
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the equation to represent this relationship is y = 7 x^2.