Friday

December 19, 2014

December 19, 2014

Posted by **JaneLee** on Friday, October 26, 2007 at 11:17am.

3.7x - 2.3y + 4.2z = 8

2.6x + 4.6y - 3.9z = 10

8x + 2z = 20

- Algebra II -
**Reiny**, Friday, October 26, 2007 at 12:06pmDoing this question by matrices seems inefficient and leads to some "nasty" arithmetic if done by hand

Why don't you take the last equation, which reduces to

z = 10 - 4x

and substitute that into the first two equations.

The resulting 2 equations in 2 unknowns does not appear too bad.

**Answer this Question**

**Related Questions**

College Algebra - Solve the system of equations using matrices. If system has no...

Algebra II - 1. solve this system using matrices: 3.7x-2.3+4.2z=8 2.6+4.6y-3.9z=...

MathJ.C. - Solve the system using matrices 4x+2y=2 5x+8y=30

Math - solve the following system of equations using matrices 4x-2y=7 7x+y=13

math - Solve the following system of equations using matrices x = -2y + 6 2x + ...

Matrices (math) - 0.433= (45.6*A) + (3.152*B) 0.3363= (11.92*A) + (37.675*B) ...

math - solve the following system of the equations using matrices 10x-5y=4 7x+y=...

Urgent please help! matrices - solve using matrices x+3y-3z=12 3x-y+4z=0 -x+2y-z...

college math - system of equations: solve the following system of operations ...

linear algebra - if: A and B are matrices and A^2 is similar to B^2 Is A ...