Which ordered pair is a solution of the system: 3x + 2y = 4 and -x + 3y = -5 ? A. (2, -1) B. (-2, 1) C. (-3, 2) D. none of the above
(2, -1) is a solution of the system: 3x + 2y = 4 and -x + 3y = -5
Question
Updated 140 days ago|7/2/2018 4:48:47 PM
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3x + 2y = 4 ;
-x + 3y = -5 ;
-x = -3y - 5 ;
x = 3y + 5 ;

3(3y + 5) + 2y = 4 ;
9y + 15 + 2y = 4 ;
11y + 15 = 4 ;
11y = 4 - 15
11y = -11 ;
y = -11/11 ;
y = -1 ;

3x + 2(-1) = 4 ;
3x - 2 = 4 ;
3x = 4 + 2;
3x = 6;
x = 6/3 ;
x = 2 ;

Solution set: (2, -1)
Added 140 days ago|7/2/2018 4:48:47 PM

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