Asked by tasha
how do you solve by gaussian elimation
2x+y=3
3x-2y=1
2x+y=3
3x-2y=1
Answers
Answered by
Steve
manipulate the equations so that all elements below the main diagonal are zero.
So, subtract row 1 from 2/3 of row 2:
2x + y = 3
2x - 4/3 y = 2/3
2x + y = 1
-7/3 y = -7/3
y = 1
now plug that into row 1 to get x = 1
So, subtract row 1 from 2/3 of row 2:
2x + y = 3
2x - 4/3 y = 2/3
2x + y = 1
-7/3 y = -7/3
y = 1
now plug that into row 1 to get x = 1