Identify the function in which y varies directly with x.

label Algebra
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 Identify the function in which y varies directly with x.
 
A.y=9x-9
B.y=9x+9
C.y=0x
D.y=x

2. 
May 11th, 2015

A function that would show y varies directly with x is one where as y increases, x would, likewise as y decreases, so does x. A straight line would suit this. All of these are straight lines, but y=0x will not work.

y=x is the best answer as they are the same value. and it goes through the origin of (0,0). To have it vary directly it must pass through the origin.

y = x is the answer


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May 11th, 2015

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May 11th, 2015
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