OG详解-OG10 数学1 Q13

The correct answer is 1. Subtracting the second equation from the first equation in the given system of equations yields (3x-3x)+(6-4) = 4y-2y, which is equivalent to 0+2 = 2y, or 2 = 2y. Dividing each side of this equation by 2 yields 1 = y.