x – 5y = 13 4x + 15y = 17
x – 5y = 13 ; 4x + 15y = 17 ; x = 5y + 13 ; Substitution method: 4(5y + 13) + 15y = 17 ; 20y + 52 + 15y = 17 ; 35y + 52 = 17 ; 35y = 17 - 52 ; 35y = -35 ; y = -35/35 ; y = -1 ; x – 5(-1) = 13 ; x + 5 = 13 ; x = 13 - 5 ; x = 8 ; Solution set: (8, -1)
Question
Asked 6/17/2019 6:25:07 AM
Updated 6/17/2019 10:17:22 AM
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8
x – 5y = 13 ;
4x + 15y = 17 ;
x = 5y + 13 ;

Substitution method:
4(5y + 13) + 15y = 17 ;
20y + 52 + 15y = 17 ;
35y + 52 = 17 ;
35y = 17 - 52 ;
35y = -35 ;
y = -35/35 ;
y = -1 ;

x – 5(-1) = 13 ;
x + 5 = 13 ;
x = 13 - 5 ;
x = 8 ;

Solution set: (8, -1)
Added 6/17/2019 10:17:22 AM
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