Texas Algebra 1, 2007
37

 PAGE: 278 SET: Exercises PROBLEM: 37

Elimination Method:

The equations are

Equation (1)

Equation (2)

Since the coefficients of y-terms are additive inverses, these terms can be elimanted by adding equations. Write the equations in column form and add the corresponding columns.

According to division property of equality: Divide each side by 2.

(Cancel common terms)

Now, find the y value by substituting  in either equation.

(Equation 1)

According to subtraction property of equality: Subtract 2 from each side.

(Apply commutative property of addition: )

(Subtract: )

The solution is .

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