y+3x/2+4=0 (1)
5y-2x+4=0 (2)
由(1)y=-3x/2-4
代入(2)
5(-3x/2-4)-2x+4=0
-15x/2-20+2x+4=0
11x/2=-16
x=-32/11
y=-3x/2-4=4/11