Question

resolvendo o sistema linear 2x-2y= -6
3x+2y=1 temos x + y igual a ?

Answer 1

2x - 2y = -6
3x + 2y = 1
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5x    //  =  -5
x = -5/5 = -1 ****

2( -1 ) - 2y = -6
-2 - 2y = -6
-2y = -6 + 2
-2y = = -4
2y = 4
y = 4/2 = 2 ****

x + y = -1 + 2  = 1 ****