Craimer's rule
First, you must prepare a fraction for both the x and y
Second, the matrix for the denominator for both the x and the y are the same
Example
X1 Y1
X2 Y2
Third, you should find the numerator of both the x and the y, and this time, they're not the same.
x + 2y + 3z = -5
3x + y - 3z = 4
-3x +4y + 7z = -7
To find the numerator of the x, for the first column of the matrix, place the numbers the come after the "=" sign, and for the second column, place the numbers with y/before the "=" sign.
To find the numerator of the y, the first column will be the numbers with x, while the second column will contain numbers that arrive after the "=" sign.
Fourth, simplify the fractions of both x and y and find the final answer
The answer for (x, y, z) is (−4, 2, 1).
By
Amal Alanazi
Sarah Alsaeed
11A