Question

解二元一次方程组：x-y=3；2y+3(x-y)=11

如题

Answer 1

直接把x-y=3代入2y+3(x-y)=11 得y=1，那就有x-1=3，x=4

Answer 2

X=3+Y 2Y+3(3+Y-Y)=11 y=1 x=4

Answer 3

y=1
x=4

Answer 4

y=2
x=5