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m23chris
 2 years ago
solve using row reduction:
4x+9y=1
3x+7y=1
m23chris
 2 years ago
solve using row reduction: 4x+9y=1 3x+7y=1

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.Sam.
 2 years ago
Best ResponseYou've already chosen the best response.0row reduction=elimination?

m23chris
 2 years ago
Best ResponseYou've already chosen the best response.0im not exactly sure what you mean

m23chris
 2 years ago
Best ResponseYou've already chosen the best response.0im trying to find x and y

.Sam.
 2 years ago
Best ResponseYou've already chosen the best response.0http://en.wikibooks.org/wiki/Linear_Algebra/Row_Reduction_and_Echelon_Forms

shivam_bhalla
 2 years ago
Best ResponseYou've already chosen the best response.0@.Sam. ,you are right

.Sam.
 2 years ago
Best ResponseYou've already chosen the best response.0First make x the same 4x+9y=1 times 3 3x+7y=1 times 4  12x+27y=3 12x+28y=4 ======== y=1 y=1 4x+9y=1 4x+9(1)=1 4x+9=1 Solve for x

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.2well row reduction deals with matrices and elimination deals with systems of equations, so they're slightly different, but they get you the same answer.

m23chris
 2 years ago
Best ResponseYou've already chosen the best response.0i need to solve it using the matrix

shivam_bhalla
 2 years ago
Best ResponseYou've already chosen the best response.0see here @m23chris : http://www.math.hmc.edu/calculus/tutorials/linearsystems/

m23chris
 2 years ago
Best ResponseYou've already chosen the best response.0we never really did it like this its hard to understand

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.24x+9y=1 3x+7y=1 4 9 1 3 7 1 1 9/4 1/4 (1/4)*R1 3 7 1 1 9/4 1/4 0 1/4 1/4 R2  3*R1 > R2 1 9/4 1/4 0 1 1 4*R2 1 0 2 R1  (9/4)*R2 > R1 0 1 1 So the solutions are x = 2 and y = 1

m23chris
 2 years ago
Best ResponseYou've already chosen the best response.0so youre dividing by 4 in the first row

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.2yes in the third step

m23chris
 2 years ago
Best ResponseYou've already chosen the best response.0ok i get it now but i have 2 more questions involving 3 rows using the matrix can you help me?

jim_thompson5910
 2 years ago
Best ResponseYou've already chosen the best response.2sure, just make a new question and let me know about it
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