Tuesday

January 27, 2015

January 27, 2015

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.

**Answer this Question**

**Related Questions**

Algebra - Two trains leave Raleigh at the same time, one traveling north, the ...

math - Supppose two trains leave Holbrook, Arizona, at the same time, traveling ...

math - Trains a and b are traveling in the same direction on parallel tracks;...

math - 2 trains leave the same train station at the same time, one train travels...

math/story problem - Trains a and b are traveling in the same direction on ...

Math story problem - Trains a and b are traveling in the same direction on ...

trig - two trains leave Kansas City at the same time. Train A is traveling due ...

ALGEBRA - I need help with two problems to finish my assignment. #1 The length ...

College Algebra - two trains leave a train station at the same time. One travels...

math algebra - Two trains leave the station at the same time, one heading east ...