42x+16y=138 (- 2)
17x+32y=180
-84x -32 y = -276 (+)
-67x = - 96
x = 1,43
17 (1,43) +32y=180
24.31 + 32 y = 180
32y = 180-24,31
32y = 155.69
y =4.86
