What is the biggest difference between an equation that has a direct variation and one that does not have a direct variation?

Can someone please help me?

Question

What is the biggest difference between an equation that has a direct variation and one that does not have a direct variation?

Can someone please help me?

danjs · Answer

are you studying just lines for this?

danjs · Answer

if y varies directly as x,   , another way to say it is they are directly proportional

y = k*x

line through the origin, slope k

danjs · Answer

if y varies directly with x,   it will be a line

if y does not vary directly,  you have some other function , not line

abbycross167 · Answer

ok! thank you very much!!!!

danjs · Answer

welcome