Posted by crystine on Sunday, September 11, 2011 at 2:28pm.
3x+y=-1
y = -1 -3x
2x+3y=18
2x + 3(-1-3x) = 18
2x - 3 - 9x = 18
-7x = 21
x = -3
Substitute -3 for x in the first problem to find the value of y.
matrix[2x,0
4,-y]=matrix[4,0
4,1]
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