# Math Help - cramer rule

1. ## cramer rule

Using cramer's method solve the system of linear equations
x + y + z = 1
ax + by + cz = 1
a^2x + b^2y + c^2z = 1
where a,b,c are distinct real numbers

2. Originally Posted by wantanswers
Using cramer's method solve the system of linear equations
x + y + z = 1
ax + by + cz = 1
a^2x + b^2y + c^2z = 1
where a,b,c are distinct real numbers
Hi,

Well first off do you know what Cramer's method, or Cramer's Rule is? The setup is half the battle. Can you do any part of the problem yourself? Once I know where you are on this I can decide where to start helping.

3. cramer's rule is

$
x=\frac{|A_x|}{|A|} y=\frac{|A_y|}{A} z=\frac{|A_z|}{|A|}
$

4. Originally Posted by wantanswers
cramer's rule is x=|AX|\|A| y=|AY|\|A| z=|AZ|\|A|
ok , so do u know how to get matrix Ax , Ay and Az and their determinants respectively ?

5. yes i used the rule sarus then i used cofactors method and i got
$
bc^2-b^2c-ac^2+a^2c+ab^2-a^2b
$