The value of y varies directly with x, and y = 1 when x = 3. Find y when x = 18.
Question
Asked 3/18/2014 10:05:37 AM
Updated 3/18/2014 8:11:55 PM
This conversation has been flagged as incorrect.
Flagged by yeswey [3/18/2014 8:09:41 PM]
Original conversation
User: The value of y varies directly with x, and y = 1 when x = 3. Find y when x = 18.

Weegy: 50
Junaid90|Points 300|

User: The value of y varies directly with x, and y = 1 when x = 3. Find y when x = 18.

Weegy: we can model this in terms of a linear equation. y=mx+b Since the question states that y varies directly with x, we know that m (the slope of the line) is 1. [ so: y=x+b Now, to solve for be we can sub in the two known values for x and y to complete our equation. 6=2+b b=6-2 =4 So our final equation for the line is: y=x+4 when x=5 y=(5)+4 =9 ]
dandix14|Points 379|

Question
Asked 3/18/2014 10:05:37 AM
Updated 3/18/2014 8:11:55 PM
This conversation has been flagged as incorrect.
Flagged by yeswey [3/18/2014 8:09:41 PM]
Rating
3
y varies directly with x, the expression should be y = kx.
y = 1 when x = 3, that is 3k = 1, so k = 1/3, the equation is y = (1/3)x, when x = 18, y = (1/3)(18) = 6
Added 3/18/2014 8:11:55 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [3/18/2014 8:12:24 PM]

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Questions asked by the same visitor
value of y varies directly with x, and y = 3 when x = 1. Find y when x = -5
Question
Updated 3/18/2014 9:06:02 PM
The value of y varies directly with x, then y = kx,
when x = 1, y = 3 then k = y/x = 3, the equation is y = 3x
when x = -5, y = 3(-5) = - 15
Added 3/18/2014 9:06:02 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [3/18/2014 9:15:08 PM]
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