resolva os sistemas: {2x-y=6;x+3y=12}
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1. 2x-y=6
2. x+3y=12
2. x= 12-3y
1. 2(12-3y)-y=6
24-6y-y=6
24-6-7y=0
18-7y=0
7y=18
y=18/7
2. 2x- 18/7= 6
2x=6+7/18
2x= 115/18
x= 115/18.1/2
x= 115/36
2. x+3y=12
2. x= 12-3y
1. 2(12-3y)-y=6
24-6y-y=6
24-6-7y=0
18-7y=0
7y=18
y=18/7
2. 2x- 18/7= 6
2x=6+7/18
2x= 115/18
x= 115/18.1/2
x= 115/36
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