# Simultaneous Linear Equation

• November 28th 2009, 07:24 PM
Paymemoney
Simultaneous Linear Equation
Hi having trouble with this equation:

$7x=18+3y$
$2x+5y=11$
I have tried using the subsitution and elimatnation method but still cannot get the correct asnwer to what the book has.
which is
$x=3$
$y=1$

Hope someone can help me.

P.S
• November 28th 2009, 07:33 PM
Roam
Did you try rearranging it into:

2x+5y=11
7x-3y=18

?
• November 28th 2009, 07:43 PM
Paymemoney
yes, i have tried that using elimination method
• November 28th 2009, 07:48 PM
Roam
Use the equations I gave you in my last post, put them in a 2x3 matrix:

2 5 3
7 -3 18

Row-reduce it and you will end up with:

1 0 3
0 1 1

Which means x=3 and y=1.
• November 28th 2009, 08:01 PM
Paymemoney
thanks i worked it out.