53

 PAGE: 381 SET: Exercises PROBLEM: 53

The system of equations are .

To write the augmented matrix,

Place the coefficients of the equations and the constant terms into matrix.

.

To make the first element in the first () row a 1, multiply the first row () by .

(The result is placed in row 1)

To make the first element in the second () row a 0, multiply the first row () by negative 2 and add the result to row 2 ().

(The result is placed in row 2)

To make the second element in the second () row a 1, multiply the second () row by .

(The result is placed in row 2)

To make the second element in the first () row a 0, multiply the second row () by and add the result to row 1().

(The result is placed in row 1)

The first row will give you the solution for .

The second row will give you the solution for .

The solution is  .

The option A is correct answer.

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