<span>The constant of variation is xy. XY=23. If X=7 then Y=23/7. </span> So as we can see, the stated inverse variation can be represented as the equation y = k/x. ===> k = 23 & x = 7 ⇒ y = 23/7. <====
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The total they paid is $23 because 1 of them bought 4 cookies for $2 each so we multiply 4 and 2 we will get $8 and the other girl bought 5 cookies for $3 each so we multiply 5 and 3 and that is $15 so we add $15 and $8 and we will end up with $23
