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4 votes
The following table shows a proportional relationship between x and y.

x y
2 9
5 22.5
8 36
Write an equation to describe the relationship between x and y.

1 Answer

4 votes

Answer:

Assume x is directly proportional to y :


y \: \alpha \: x \\ y = kx

when y is 9, x is 2:

substitute to find value of k :


9 = (k * 2) \\ k = (9)/(2)

Therefore, equation is:


{ \boxed{ \boxed{2y = 9 x}}}

User Jasper Seinhorst
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