SOLUTION: if y caries directly as the square root of x and x=25 when y=-15, find x when y=-108 can u just show me how to solve the problem, not the answer??? thanks!!!!!

Algebra ->  Equations -> SOLUTION: if y caries directly as the square root of x and x=25 when y=-15, find x when y=-108 can u just show me how to solve the problem, not the answer??? thanks!!!!!      Log On


   

Question 280666: if y caries directly as the square root of x and x=25 when y=-15, find x when y=-108
can u just show me how to solve the problem, not the answer??? thanks!!!!!
Answer by jsmallt9(3758) About Me  (Show Source):
You can put this solution on YOUR website!
The phrase "y varies directly as (something)" it means:
y = k*(something)
where k is some constant.
So your equation is:
y+=+k%2Asqrt%28x%29

Now you
  1. use this equation and the given x,y pair (25, -15) to find out what k is.
  2. rewrite the equation with the value you found for k.
  3. use the new equation to find the x for y = -108.