Question 254857
It says If y=4 when x=2, find y when x=16.
How do you solve this? 
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In "direct variation" the relation is:
y = kx
where
k is a constant
.
The problem gives you the fact that:
If y=4 when x=2
Use this to discover what k is:
Plugging what we know into:
y = kx
4 = k(2)
4/2 = k
2 = k
.
So, our relation is:
y = 2x
To find y when x=16 simply plug x into:
y = 2x
y = 2(16)
y = 32