177x-543y=897 (2)

( 1)+(2)

500x-86y=2000

x=4+86y/500=4+0. 172y

( 1)-(2)

186x+ 1000y=206

(4+0. 172y)* 186+ 1000y = 206

y =-0.52 132 187 1

x=3.9 10332638