gcarter1203 gcarter1203

03-12-2018
Mathematics

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In a direct variation, y=18 when x=9. Write a direct variation equation that shows the relationship between x and y

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jimrgrant1 jimrgrant1

03-12-2018

Answer:

y = 2x

Step-by-step explanation:

since x and y vary directly then the equation is

y = kx ← k is the constant of variation

to find k use the given condition y = 18 when x = 9

k = [tex]\frac{y}{x}[/tex] = [tex]\frac{18}{9}[/tex] = 2, hence

y = 2x ← is the equation relating x and y

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