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45 votes
Y is in direct proportion to x. x = 25, y = 5. Find the value of y, if x = 9.​

User Nuetrino
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1 Answer

11 votes
11 votes

Answer:

y = 1.8

Explanation:

given y is in direct proportion to x then the equation relating them is

y = kx ← k is the constant of proportion

to find k use the condition x = 25, y = 5 , then

5 = 25k ( divide both sides by 25 )


(5)/(25) =
(1)/(5) = 0.2 = k

y = 0.2x ← equation of proportion

when x = 9 , then

y = 0.2 × 9 = 1.8

User Santiago Robledo
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