Question

解方程组4(x+1)-6(y-1)=20 2(x+1)+7(y-1）=20

Answer 1

4(x+1)-6(y-1)=20 ---(1)

2(x+1)+7(y-1)=20 ---(2)

(2)X2

4(x+1)+14(y-1)=40 ---(3)

(3)-(1)

20(y-1)=20

y=2

将y=2带入（1）,得

4(x+1)-6(y-1)=20

x=11/2