x-3y/3-1/3=1 2x-x-3y/4=5二元一次方程组怎么解=、
问题描述：
x-3y/3-1/3=1 2x-x-3y/4=5二元一次方程组怎么解
=、
答
(x-3y)/3 - 1/3 = 1
x-3y-1 = 3
x-3y = 4 (1)
2x - (x-3y)/4 = 5
8x - x + 3y = 20
7x + 3y = 20 (2)
(1) + (2)
8x = 24
x = 3
y = -1/3