x + 2y = 6 x + y = 4
x + 2y = 6 ; x + y = 4 ; y = -x + 4 ; Substitution method: ; x + 2(-x + 4) = 6 ; x - 2x + 8 = 6 ; -x + 8 = 6 ; -x = 6 - 8 ; -x = -2 ; x = 2 ; x + 2y = 6, x = 2 ; 2 + 2y = 6 ; 2y = 6 - 2 ; 2y = 4 ; y = 4/2 ; y = 2 ; Solution set: (2, 2)
Question
Updated 7/21/2019 6:51:15 PM
Edited by Masamune [7/21/2019 6:50:49 PM]
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x + 2y = 6 ;
x + y = 4 ;
y = -x + 4 ;

Substitution method: ;
x + 2(-x + 4) = 6 ;
x - 2x + 8 = 6 ;
-x + 8 = 6 ;
-x = 6 - 8 ;
-x = -2 ;
x = 2 ;

x + 2y = 6, x = 2 ;
2 + 2y = 6 ;
2y = 6 - 2 ;
2y = 4 ;
y = 4/2 ;
y = 2 ;

Solution set: (2, 2)

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