40

 PAGE: 380 SET: Exercises PROBLEM: 40

Given equations are,

.

.

Write the augmented matrix,

Place the coefficients of the equations and the constant terms in to matrix.

Notice that the first element in the second row is 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 2 and added 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 subtracted the rows together.

(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  .

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