Posted by Chris on Monday, January 14, 2008 at 4:40pm.
How do you solve this by linear combinations?
4x+3y=8
3x3y=15

Math  mktintin, Monday, January 14, 2008 at 5:02pm
L1 : 4x+3y=8
L2 : 3x3y=15
Do L1+L2> 7x=7 so x=1
in L1 4*(1)+3y=8
3y=12
y=4
the couple of solution is(1,4)

Math  DrBob222, Monday, January 14, 2008 at 5:13pm
No. Add equation 1 (what mktintin labels L1) to equation 2, (L2) to obtain
7x +0y = 8+15
7x=7
x=1

Math  mktintin, Monday, January 14, 2008 at 5:14pm
doing L1+L2>4x+3x+3y3y=8+15
>7x=7
x=1
do u understand?

Math  Michael, Monday, January 14, 2008 at 5:17pm
Oh i was looking at it all wrong alright i understand it a bit better now, doh was plugging in the wrong numbers haha. Sorry.
Answer This Question
Related Questions
 Algebra 2  Solve using linear combinations. x  5y = 6 3x + 4y = 18 What are ...
 Math  Use linear combinations to solve the system of linear equations. 5x=4y30...
 Math  use linear combinations to solve the system of linear equations. 2x+y=4 x...
 math  PLEASE!!!!i need help on these 4: *4y=153x 2y=3x+21 *4x=5y14 y=6x9 *...
 math  PLEASE!!!!i need help on these 4: *4y=153x 2y=3x+21 *4x=5y14 y=6x9 *...
 math  i only need help on these two: *2/3y=10+4x 5x=1/3y8 *5x=4y30 2x+3y=12 ...
 maths  use the substitution method to solve the linear system. 1. 3x=9 x+2y=9 ...
 Linear combinations  Solving linear combinations Do you have a particular ...
 Algebra HELP  USE LINEAR COMBINATIONS TO SOLVE THE SYSTEM OF LINEAR EQUATIONS (...
 Discrete Math  True or False? Homogeneous linear recurrence equations are ...
More Related Questions