SOLUTION: The variables x and y vary directly. When x is 5, y is 15. If x is 25, what is y? a. 1/3 b. 3 c. 25/3 c. 75

Question 453910: The variables x and y vary directly. When x is 5, y is 15. If x is 25, what is y?
a. 1/3
b. 3
c. 25/3
c. 75
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
The variables x and y vary directly.
y = kx
---
Solve for "k" using "When x is 5, y is 15".
----
15 = k*5
k = 3
---
Equation:
y = 3x
-----
Solve: If x is 25, what is y?
y = 3*25
y = 75
==================
Cheers,
Stan H.
============
a. 1/3
b. 3
c. 25/3
c. 75

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