Saturday

October 25, 2014

October 25, 2014

Posted by **Lauren** on Tuesday, March 16, 2010 at 12:06am.

How do I put this into two equation and use the matrix to solve it?

- math -
**FredR**, Tuesday, March 16, 2010 at 3:45amu = 2d

or

u - 2d = 0

u + d = 5

so the matrix would be

1 -2 0

1 1 5

add -1 times the 1st row to the 2nd row. Then you get

1 -2 0

0 3 5

multiply the 2nd row by 1/3:

1 -2 0

0 1 5/3

The 2nd row tells us that d = 5/3, so u = 10/3

- math -
**PsyDAG**, Tuesday, March 16, 2010 at 11:02amI don't know about the matrix, but it is not necessary to solve the problem.

x = time traveling down river

2x = time traveling up river.

x + 2x = 5

3x = 5

x = 5/3 hour = 1 hour, 40 minutes

2x = ?

I hope this helps.

**Answer this Question**

**Related Questions**

Math word problem - The Mad River flows at a rate of 3 km/h. In order for a boat...

Math word problem check - The Mad River flows at a rate of 3 km/h. In order for ...

Physics - A boat is rowed directly upriver at a speed of 2.4 m/s relative to the...

Math-Algebra - A car takes 3 hours to travel a distance of 240 km with a speed ...

Physics - A fisherman notices that his boat is moving up and down periodically, ...

Physics - A fisherman notices that his boat is moving up and down periodically, ...

Algebra - Shoreline Travel operates a 3hr paddle boat cruise on the Missouri ...

College Physics - A fisherman notices that his boat is moving uo and down ...

Physics Easy one - A fisherman notices that his boat is moving up and down ...

math - Navigation. The current in a typical Mississippi River shipping route ...