okay so I need confirmation that there is something wrong with this question. This is a midterm review and I'm FREAKING out here. I'm not sure if i'm doing this all wrong, or what?

Suppose y varies directly with x, and y=-14 when x=9. What direct variation equation relates x and y?
A) Y=-.64x
B)Y= 1.56x
C)Y=-0.07x
D) Y= -1.56x
(the closest thing i got to -14 was answer D, as -14.04 ,PLEASE HELP ASAP!!!)

Question

okay so I need confirmation that there is something wrong with this question. This is a midterm review and I'm FREAKING out here. I'm not sure if i'm doing this all wrong, or what?

Suppose y varies directly with x, and y=-14 when x=9. What direct variation equation relates x and y? 
A) Y=-.64x
B)Y= 1.56x
C)Y=-0.07x
D) Y= -1.56x
 (the closest thing i got to -14 was answer D, as -14.04 ,PLEASE HELP ASAP!!!)

anonymous · Answer

No there is an answer, it's d. Check your work.

jim_thompson5910 · Answer

"Suppose y varies directly with x" means that y = kx where k is some constant

Since we are told that "y=-14 when x=9" we can plug these two pieces of info in and solve for k to get

y = kx

-14 = k*9

-14/9 = k

k = -14/9

k = -1.56 (approximate and we're rounding to the nearest hundredth)

So that explains why the answer is y = -1.56x

anonymous · Answer

y = kx

-14 = 9k

k = -14/9

k is roughly -1.55556

So it's:

Y = -1.56x

anonymous · Answer

thanks guys! i was gonna die there i'm so glad i found this site