Posted by Vee on Friday, February 1, 2013 at 7:26am.
PLEASE help with the below.
Solve the system of equations by first expressing it in matrix form as and then evaluating.
a). 3x2y=5
4xy =10
b). 3x 2y =2
4x y = 3

algebra  Reiny, Friday, February 1, 2013 at 8:55am
uggghhh, matrices for such simple systems ???
anyway ....
1st one:
3 2 5
4 1 10
1 1 15 > #2  #1
3 2 5 > #1
1 1 15 > #1
0 5 50 > 3x#1  #2
1 1 15 >#1
0 1 10 > #2 รท 5
1 0 5 #1  #2
0 1 10 > #2
so x = 5 and y = 10

same thing using substitution
form #2, y = 4x+10
sub into #1
3x  2(4x+10) = 5
3x  8x  20 = 5
5x = 25
x = 5 , then y = 20+10 = 10
You try the second one, remember in the matrix method there is no one correct way,
what I did above just seemed like a way to me, you might have taken a different path.

algebra  Vee, Friday, February 1, 2013 at 9:56am
Thank you.
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