SOLUTION: The ordered pairs are for a direct variation. Find the missing value. I know that the direct variation form is y=kx but I'm not sure how to use it to find the missing value of the

Question 281609: The ordered pairs are for a direct variation. Find the missing value. I know that the direct variation form is y=kx but I'm not sure how to use it to find the missing value of the ordered pair.
(-2,8) and (x,12)
Found 2 solutions by jim_thompson5910, richwmiller:
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Since each ordered pair is of the form (x,y), this means that the point (-2,8) gives the values x=-2 and y=8

So plug these values into to get . Now divide both sides by -2 to get . So the equation is . Now the point (x,12) means that y=12. So plug this into to get . Finally, divide both sides by -4 to isolate 'x' to get

So the second point is (-3,12). Let me know if this helps.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
y=kx
plug in the first ordered pair (-2,8) to find k
8=k*(-2)
-4=k
y=-4x
now plug in the y of (x,12) to find x
12=-4x
-3=x
(-3,12)
RELATED QUESTIONS
The ordered pairs are for a direct variation. Find the missing value. I know that the... (answered by Mathematicians)
{{{ (2,1)and(6,y) }}} Suppose the ordered pairs in this exercise are for the same... (answered by Cintchr)
The ordered pairs represent a direct variation. Find the missing value for each. (4,... (answered by shree840)
In this problem, the direct variation being represented is: 9y+4x=3.5 The problem also... (answered by jim_thompson5910,josgarithmetic)
The ordered pairs are for the same direct variation. Find each missing value. (-1,2) and (answered by funmath)
The question states: Each set of ordered pairs is for a direct variation. Find each... (answered by stanbon)
SUPPOSE EACH ORDER PAIRS ARE FOR THE SAME DIRECT VARIATION. FIND EACH MISSING VALUE... (answered by stanbon)
SUPPOSE EACH ORDER PAIRS ARE FOR THE SAME DIRECT VARIATION. FIND EACH MISSING VALUE. A.... (answered by fractalier)
The ordered pairs in each exercise are for the same direct variation. Find each missing... (answered by stanbon)