Create a coefficient matrix:
3x + y = 0-x – 5y = 4
Hint
Coefficients are the numbers in front of the variables, and the answer will be 2 by 2 matrix.
Answer
3x – 4y = -7x + y = 9
2x + 2y = 116x – y = 3
Find the determinant:
Crisscross minus applesauce.
17
-4
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