SOLUTION: I am so confused about this question, I don't know where to start. This is how it was typed on the word document. . Jack was able to travel 30 miles downstream in 2 hours. In r

Algebra ->  Absolute-value -> SOLUTION: I am so confused about this question, I don't know where to start. This is how it was typed on the word document. . Jack was able to travel 30 miles downstream in 2 hours. In r      Log On


   

Question 143508: I am so confused about this question, I don't know where to start. This is how it was typed on the word document.
. Jack was able to travel 30 miles downstream in 2 hours. In returning upstream, it took 3 hours to make the trip. How fast can his boat travel in still water? What was the rate of the river current?



2(r+c)=30--->2r+2c=30-->6r+6c=90
3(r-c)=30---->3r-3c=30--> 6r+6c=60

Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
Minor error is causing you grief
2(r+c)=30--->2r+2c=30-->6r+6c=90
3(r-c)=30---->3r-3c=30--> 6r+6c=60 <-- you changed - to + here
3(r-c)=30---->3r-3c=30--> 6r-6c=60 should be this
Now just use elimination to solve. See here for a video on solving systems of equations. http://collabvsl.wetpaint.com/page/Solving+Systems+of+Equations
6r + 6c = 90
6r - 6c = 60
------------
12r = 150
r = 12.5
r+c = 15
12.5 + c = 15
c = 2.5
Does that check out?