Solve the system of equations 3x + y = –7 and x – y = –5
3x + y = –7 ; x – y = –5 ; Substitution method: y = x + 5 ; 3x + x + 5 = –7 ; 4x + 5 = -7 ; 4x = -7 - 5 ; 4x = -12 ; x = -12/4 ; x = -3 ; 3(-3) + y = –7 ; -9 + y = -7 ; y = -7 + 9 ; y = 2 ; Solution set: x = -3, y = 2
Question
Updated 90 days ago|12/18/2018 2:26:00 PM
Edited by Masamune [12/11/2018 12:07:42 AM]
Rating
4
3x + y = –7 ;
x – y = –5 ;

Substitution method:
y = x + 5 ;
3x + x + 5 = –7 ;
4x + 5 = -7 ;
4x = -7 - 5 ;
4x = -12 ;
x = -12/4 ;
x = -3 ;

3(-3) + y = –7 ;
-9 + y = -7 ;
y = -7 + 9 ;
y = 2 ;

Solution set: x = -3, y = 2
Added 98 days ago|12/11/2018 12:07:44 AM
Rated good by Wilfredorv31

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