Question

cuanto es
$y = 3x - 1 \\ x - 2y = 12$
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Answer 1

y+3y=-1. multiplicar x2

x-2y=12

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2y + 6x = -2

x-2y = 12

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7x = 10

x= 10\7

reemplazar :

x- 2y =12

10/7-2y= 12

10 - 14y /7 = 12

10- 14 y = 104

14y = 94

y = 94/14