SOLUTION: let y vary directly as x. If y-10 when x=4, what is x when y =7?

SOLUTION: let y vary directly as x. If y-10 when x=4, what is x when y =7?

Algebra.Com

Question 33339: let y vary directly as x. If y-10 when x=4, what is x when y =7?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
y varies directly as x means y=kx
Need to find "k".
10=k(4)
k=(5/2)
EQUATION:
y=(5/2)x
Find "x" when y=7.
7=(5/2)x
x=14/5
Cheers,
Stan H.
RELATED QUESTIONS
Let y vary inversely as x. If x = 2.6hen y = 5, what is y when x =... (answered by stanbon,Nate)

If x and y vary directly, and x=10 when y=3, what will be the value of x when... (answered by Edwin McCravy,MathLover1)

If x varies directly as y, and x = 8 when y = 12, what is y when x =... (answered by sudhanshu_kmr)

If y varies directly as x, and y = 7 when x =5, find y when x =10 y= blank? (answered by Alan3354)

The variable x and y vary directly. When x=-4, y=16. What is the constant of... (answered by stanbon)

22 is 80% of what?/ 32 is whatt percent of 56?/ and if x is 8 when y is 18, and x and y... (answered by longjonsilver,mrduffner)

22 is 80% of what?/ 32 is whatt percent of 56?/ and if x is 8 when y is 18, and x and y... (answered by longjonsilver)

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 x = 10 when y = 4, find y when x =... (answered by math_helper)