两道题,谢谢!o(^▽^)o

两道题,谢谢!o(^▽^)o
两道题,谢谢!o(^▽^)o

两道题,谢谢!o(^▽^)o
(1)
①X3:15x-18y=33 ③
②X2:16x-18y=26 ④
④-③:x=-7 ⑤
把⑤代入①:5(-7)-6y=11
6y=-24
y=-4
∴x=-7
y=-4
(2)
有①得:3y+3=4x+8
4x-3y=-5 ③
③-②:2x=4 ④
x=2
把④代入②:4-3y=1
3y=3
y=1
∴x=2
y=1