- #1
lina29
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Homework Statement
Solve the system:
ax1+3x2+x3= y1
ax2= y2
-5x1+ax2-x3=y3
using cramer's rule for those a such that the det of A is not 0
Homework Equations
x1= det(A1)/det(A)
det(A1)=a11+c11+a21c21+a31c31
and A1=
y1 3 1
y2 a 0
y3 a 1
The Attempt at a Solution
By using those equations I got the det(A1) to go ay1+(-3+a)y2-ay3
and the det(A) was a[itex]^{}2[/itex]-5a
and x1=(ay1+(-3+a)y2-ay3)/a[itex]^{}2[/itex]-5a
But that was counted wrong. I don't understand where I went wrong since I have doublechecked my calculations