9. Use the matrix inverse method to solve the following system of equations. (10%)2x + 3 y + z = −13x + 3 y + z = 12x + 4y + z = −2

C. Hybrid tilapia is a relatively inexpensive seafood source for common households in Taiwan. To maintain low production cost, the protein content of a typical local commercial tilapia diet is approximately 250 g kg-1. Furthermore, it is common practice to totally substitute the plant protein source, mainly soybean meal, for fish meal to reduce the cost of tilapia feed. Therefore, the anti-nutrients in soybean meal may influence the digestibility of the diet to tilapia. (25%)

9. Use the matrix inverse method to solve the following system of equations. (10%)
2x + 3 y + z = −1
3x + 3 y + z = 1
2x + 4y + z = −2

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