# Chapter 4 - Section 4.2 - Solving Systems of Linear Equations by Substitution - Exercise Set: 3

x = -3 y = 9

#### Work Step by Step

x + y = 6; y=-3x Substitute y for -3x to the first equation. x -3x = 6 -2x = 6 x = -3 (divide both sides by -2 ) Substitute x=-3 to the second equation. y = -3 $\times$ (-3) y = 9

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