# WARM UP GRAPHING LINES Write the equation in slope- intercept form and then Graph. (Lesson 4.7) 1.3x + y = 1 2.x + y = 0 3.y = -4 3.

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WARM UP GRAPHING LINES Write the equation in slope- intercept form and then Graph. (Lesson 4.7) 1.3x + y = 1 2.x + y = 0 3.y = -4 3

WARM UP GRAPHING LINES Write the equation in slope- intercept form and then Graph. (Lesson 4.7) 1.3x + y = 1 2.x + y = 0 3.y = -4 2

WARM UP GRAPHING LINES Write the equation in slope- intercept form and then Graph. (Lesson 4.7) 1.3x + y = 1 2.x + y = 0 3.y = -4 1

GRAPHING LINES Write the equation in slope- intercept form and then Graph. (Lesson 4.7) 1.3x + y = 1 2.x + y = 0 3.y = -4 WARM UP 0

7.3 Linear CombinationsGOAL Solve a system of linear equations by linear combinations. KEY WORDS linear combinations

Add the Equations Solve the linear system 4x + 3y = 16EQUATION 1 2x – 3y = 8EQUATION 2SOLUTION ① ADD ① ADD the equations to get an equation in one variable. 7.3 Linear Combinations EXAMPLE 1

Add the Equations Solve the linear system 4x + 3y = 16EQUATION 1 2x – 3y = 8EQUATION 2SOLUTION SUBSTITUTE ②SUBSTITUTE 4 for x into either equation and solve for y. 7.3 Linear Combinations EXAMPLE 1

Add the Equations Solve the linear system 4x + 3y = 16EQUATION 1 2x – 3y = 8EQUATION 2SOLUTION ③ CHECK by substituting 4 for x and 0 for y in each of the original equations. ANSWER> The solution is (4, 0) 7.3 Linear Combinations EXAMPLE 1

7.3 Linear Combinations CHECK POINT Solve the linear system by Linear Combination. 1.3x + 2y = 7 -3x + 4y = 5 2.4x – 2y = 2 3x + 2y = 12 3.5x + 2y = -4 -5x + 3y = 19

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