SOLUTION: find an equation of variation where y varies directly as x and y = 100 when x=4

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Question 866539: find an equation of variation where y varies directly as x and y = 100 when x=4
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
"y varies directly as x" means that y+=+k%2Ax for some constant k (ie k is a fixed number)


Plug in y = 100 and x=4. Then solve for k


y+=+k%2Ax


100+=+k%2A4


100%2F4+=+k


25+=+k


k=25


So y+=+k%2Ax gets updated to y+=+25x. That is the equation. So we stop here.


Final Answer: y+=+25x