Question 150793
A direct variance means that as x increases y increases. Also as x decreases y decreases . So this is reflected by the equation {{{y=kx}}}



{{{y=kx}}} Start with the given equation.



{{{-10=k(-7)}}} Plug in {{{x=-7}}} and {{{y=-10}}}.



{{{-10=-7k}}} Rearrange the terms



{{{(-10)/(-7)=k}}} Divide both sides by -7.



{{{10/7=k}}} Reduce



{{{k=10/7}}} Rearrange the equation



So the equation is {{{y=(10/7)x}}}