Question

x + 2y+ 4i=11+(9x-y)i

Answer 1

x+2y= 11
9x-y= 4(×2)

x+2y=11
18x -2y=8
________+
19x = 19
x=19/19
x=1


Substituir em qualquer linha
x+2y=11
1 +2y=11
2y=11-1
y=10/2
y=5