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# if "y" varies directly with "x", find the constant of variation for an equation containing the following points (-1.5,4.5) and (2.8,-8.4)

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if "y" varies directly with "x", find the constant of variation for an equation containing the following points (-1.5,4.5) and (2.8,-8.4)

Guest Apr 7, 2015

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+92217
+10

$$\\y=kx\qquad Where k is the constant of variation\\\\ 4.5=k*-1.5\\\\ 4.5/-1.5=k\\\\ k=-3\\\\ check\\\\ -3*2.8=-8.4\quad Yes that is what it needed to be$$$Melody Apr 8, 2015 Sort: ### 1+0 Answers #1 +92217 +10 Best Answer $$\\y=kx\qquad Where k is the constant of variation\\\\ 4.5=k*-1.5\\\\ 4.5/-1.5=k\\\\ k=-3\\\\ check\\\\ -3*2.8=-8.4\quad Yes that is what it needed to be$$$

Melody  Apr 8, 2015

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