Question

用代入法解下列方程组{x-y-6,2x+3y-8 {3（y-2）=x-17,2（x-1）-5y-8

Answer 1

{x-y-6=0 (1)

,2x+3y-8=0 (2)

x-y-6=0

x=y+6

2(y+6)+3y-8=0

2y+12+3y-8=0

5y=-4

y=-4/5

x=26/5

{3（y-2）=x-17,

2（x-1）-5y-8=0

3（y-2）=x-17

3y-6=x-17

x=3y+11

2（3y+11-1）-5y-8=0

6y+20-5y-8=0

y=-12

x=-25