durancv2018 durancv2018

10-11-2020
Mathematics

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The value of y varies directly with the value of x. Which function represents the relationship between x and y if y=7/3 when x=21?

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topeadeniran2 topeadeniran2

15-11-2020

Answer: y = 1/9x

Step-by-step explanation:

Since it's a direct proportion, the formula to use will be:

y = kx

where,

y = 7/3

x = 21

k = unknown

y = kx

7/3 = 21k

k = 7/3 ÷ 21

k = 7/3 × 1/21

k = 1/9

The function will then be:

y = kx

y = 1/9x

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