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21-11-2019
Mathematics

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The variables y and x have a proportional relationship, and y = 5 when x = 4.
What is the value of x when y = 8?

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Аноним Аноним

21-11-2019

If the variables y and x have a proportional relationship, we have

[tex]xy=k[/tex]

Since (x,y)=(4,5) is a valid pair, we know that

[tex]xy=20[/tex]

So, if y = 8, we have

[tex]8x=20 \iff x=\dfrac{20}{8}=\dfrac{5}{2}[/tex]

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