Question 949903

if {{{y}}} varies direct with {{{x}}}, then {{{y=kx}}} 

write a direct variation equation that relates {{{x}}} and {{{y}}} if {{{x = 4}}} and {{{y =-2}}}:

we need to find constant {{{k}}}

{{{y=kx}}} .....plug in {{{x = 4}}} and {{{y =-2}}}

{{{-2=k*4}}}

{{{-2/4=k}}}

{{{k=-1/2}}}

so, direct variation equation will be: {{{y=-(1/2)x}}}