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December 18, 2014

December 18, 2014

Posted by **alicia** on Monday, February 7, 2011 at 4:27am.

this is what I figured:

r * t= d

y=x+14.

3x + 3y= 315

- math -
**Reiny**, Monday, February 7, 2011 at 10:15amI used to make my students draw up a chart for these type of questions, having 3 columns for (D)istance, (R)ate, and (T)ime, and two rows for the different situations, in this case North and South

..........D....R.....T

north .. 3x .. x ... 3

south 3(x+14) x+14 .. 3

Now use the information that the sum

of the two distances is 315 to get

so 3x + 3(x+14) = 315

easy from there.

Why are you using 2 unknowns ?

Notice that if you subbed in your first equation into your second, you would get my equation.

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