Suppose y varies directly with x. if y = -4 when x = 8, what is the equation of direct variation?
complete the steps to write the equation of direct variation.
1. start with the equation of direct variation y = kx.
2. substitute in the given values for x and y to get
3. solve fork to get
4. write the direct variation equation with the value found for k. the equation is

k = -1/2

y= -1/2x

Step-by-step explanation:

y = kx

We know y = -4 and x=8

-4 = k*8

Divide each side by 9

-4/8 = 8k/8

-1/2 =k

y= -1/2x

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b. 18

step-by-step explanation:

so the equation for this is:

ab^2=ac⋅ad

ab being the top length of 6 and ac being the length of 2 and ad being the length of x. let's plug into the equation:

6^2 = 2x

now lets just solve for x:

36 = 2x

18 = x

i hope that !