Find the direct variation equation of the graph through the points (0, 0) and (1, -2). Write in y=kx form.
y = 2x
y = -2x
y = 1/2 x
y = -1/2 x
please helkp me to figure out how to do this! please and thanks!

Question

Find the direct variation equation of the graph through the points (0, 0) and (1, -2). Write in y=kx form. 
    y = 2x 
   y = -2x 
   y = 1/2 x 
   y = -1/2 x 
please helkp me to figure out how to do this! please and thanks!

anonymous · Answer

you know it looks like $y=kx$ you just don't know $k$ 
but if you make $x=1,y=-2$ you get $-2=k\times 1=k$ so you know $k=-2$ and the equation is $y=-2x$

anonymous · Answer

im sorry that didnt make sense

anonymous · Answer

Look, you know that it is of the form y=kx right?