# Chapter 4 - Section 4.3 - Solving Systems of Linear Equations by Addition - Exercise Set: 9

x = -7 y = 5

#### Work Step by Step

x + 5y = 18 first equation -3x - 15y = - 54 multiply by -3 3x + 2y = -11 second equation ________________ - 13y = - 65 add the equations to eleminate x y = 5 divide both sides by -13 let y = 5 in first equation x + $5\times5$ = 18 x + 25 = 18 x = 18 - 25 subtract 25 from both sides x = -7

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