SOLUTION: If y varies directly as x, and y = 7 when x =5, find y when x =10 y= blank?

Question 696078: If y varies directly as x, and y = 7 when x =5, find y when x =10
y= blank?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
If y varies directly as x, and y = 7 when x =5, find y when x =10
---------------
y = k*x
7 = k*5
k = 7/5 = 1.4
------
@ x = 10:
y = 1.4*10
y = 14
====================
Or using proportions:
y = k*x
y/x = k (a constant)
7/5 = k = y/10
7/5 = y/10
5y = 70
y = 14

RELATED QUESTIONS
if y varies directly as x, and y=10 when x=7,find y when... (answered by josgarithmetic,greenestamps,Edwin McCravy)

If y varies directly as x, and y = 7 when x=5, find y when x=15.... (answered by stanbon)

If y varies directly as x, and x = 10 when y = 4, find y when x =... (answered by math_helper)

If y varies directly as x and x=10 when y=4, find y when... (answered by ewatrrr)

y varies directly as x. if y=16 when x=5, find y when... (answered by Fombitz)

If y varies directly as x, and x = 10 when y = 8, find y when x = 15.... (answered by ewatrrr)

If y varies directly as x, and y=6 when x=5, find y when x=15. y= (answered by amalm06)

If y varies directly as the square of x, and y=7 when x=9, find y when... (answered by midwood_trail)

If y varies directly as x^2, and if y=36 when x=2, find y when... (answered by psbhowmick)