How do I determine this? Direct variation.

Question

anonymous · Answer

attachment

anonymous · Answer

@jim_thompson5910

solomonzelman · Answer

A direct variation is:  $\large\color{black}{ y=kx    }$

(which can be written as m (k, or m, doesn't matter) the coefficient of the x is the slope)

$\large\color{black}{ y=mx   }$ is a direct variaon.
$\large\color{black}{ y=mx +b   }$  (If  $\large\color{black}{ b\ne0    }$) is NOT a direct variation.

anonymous · Answer

Oh ok!

solomonzelman · Answer

yes, direct variation is basically a line that has a y-intercept of 0.
(Saying that there will be just a pure  y=mx,  without "+b" part)

if the line has a non-zero y-intercept, then it is not a direct variation.

solomonzelman · Answer

which option do you think is a direct variation and which is not?

anonymous · Answer

11 is  
12 isn't.

solomonzelman · Answer

yes, correct.

solomonzelman · Answer

Now you need to find this constant of variation in number 11.

anonymous · Answer

constant is 3/2

solomonzelman · Answer

close try again (the sign)

solomonzelman · Answer

(and the fraction is the other way)

anonymous · Answer

Oops -2/3 sorry new keyboard. And I type dyslexic all the time when I try to type fast.

solomonzelman · Answer

ohh, lol... typos happen. yes it is -2/3.

solomonzelman · Answer

if you got any questions, ask away...

anonymous · Answer

That was all for now. I'll be sure to let you know if I have any later on!

solomonzelman · Answer

Okay, yw!