ive never done linear system w 4 variables.

solve the linear system:
A + B= 3
2B + C = 4
6A + 3B + 2C + D = 16
6B + 3C + 2D + E = 20
9A + 6C + 2E = 9

Question

ive never done linear system w 4 variables.

solve the linear system: 
A + B= 3 
2B + C = 4 
6A + 3B + 2C + D = 16 
6B + 3C + 2D + E = 20 
9A + 6C + 2E = 9

ivettef365 · Answer

i see 5 variables

hero · Answer

and 5 equations

hero · Answer

The best way to solve this is with matrices.

anonymous · Answer

sorry about that, 5 variables and 5 equations

anonymous · Answer

matrices?

anonymous · Answer

eliminate any one variable and make four equations in four variables.
then eliminate one variable and as above make three equations.
then eliminate one variable and make two equations
find two values by substitution or elimination or otherwise
then plug the two values and find third value, then fourth and fifth.

anonymous · Answer

im not really following. sorry.  should i read up on a specific topic within matrices? or just matrices?

phi · Answer

See http://www.khanacademy.org/math/linear-algebra/vectors_and_spaces/matrices_elimination/v/matrices--reduced-row-echelon-form-1

anonymous · Answer

thank you phi!!!!!!  you rock!