Math
posted by alex on .
I need the answers and the work shown steb by step today pls^^
For each direct variation find the constant of variation.Then find the value of y when x= 5
1.y=2 whne x=7
2.y=2 when x=2
3.y= 17 when x=4
y varies directly with x.
1.if y=6 when x=2,find x whn y=12
2.if y=7 when x= 3,find y when x= 1

If there is a direct variation, then y is proportional to x. This can be written y = kx. Use the information you are given to determine k.
1. If y = kx and y=2 when x = 7, then
2 = 7k, and
k = 2/7, so
y = (2/7)x
Whe x = 5, y = 10/7
Do the others the same way.
1. If y=6 when x=2, then k=3 and y = 3x.
When x=12, y = ? 
Well thanks but in the other questions im guessing that y stays the same so 1. will be equal to 1/2 and 2.7/1 correct me if im wrong pls but is also suspicious because it says y varies direclty with x idk what that means