Suppose y varies directly with x, and y = 8 when x = -6. What direct variation equation relates x and y? What is the value of y when x = -2?

Choose one answer.
a. y = -0.75x; 1.50
b. y = -1.33x; 2.67
c. y = 1.33x; -2.67
d. y = 0.13x; -0.25

Question

Suppose y varies directly with x, and y = 8 when x = -6. What direct variation equation relates x and y? What is the value of y when x = -2?

Choose one answer.
a. y = -0.75x; 1.50	
b. y = -1.33x; 2.67	
c. y = 1.33x; -2.67	
d. y = 0.13x; -0.25

nikato · Answer

Direct variation

y=kx
So plug in 8 for y and -6 for x and solve for k

nikato · Answer

So plug those numbers in y=kx, which is the equation for direct variation

And u get
8=-6k.    Now divide both sides by -6 to find k
--  ---
-6.  -6

k=?