r varies directly as s. Find r when s=4 and k=2

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alliehouston22 alliehouston22

13-06-2017
Mathematics

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r varies directly as s. Find r when s=4 and k=2

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jdoe0001 jdoe0001 · Answer 1 · 2017-06-13T23:49:52+02:00

[tex]\bf \begin{array}{cccccclllll} \textit{something}&&\textit{varies directly to}&&\textit{something else}\\ \quad \\ \textit{something}&=&{{ \textit{some value}}}&\cdot &\textit{something else}\\ \quad \\ y&=&{{ k}}&\cdot&x \\ && y={{ k }}x \end{array}\\\\ -------------------------------\\\\ thus\implies r=ks\qquad \begin{cases} k=2\\ \uparrow \\ constant\ of\\ variation\\ s=4 \end{cases}\implies r=2\cdot 4[/tex]