Question

encontre os numeros reais x e y de modo que: 2x-y+(x+y)i=7+8

Answer 1

2x-y=7 ⇒ y=2x-7
x+y=8

x+y=8
x+(2x-7)=8
3x-7=8
3x=8+7
3x=15
x=15/3
x=5

y=2x-7
y=2(5)-7
y=10-7
y=3

2x-y+(x+y)i = 2(5)-3+(5+3)i = 10-3+(8)i = 7+8i

Resposta: x=5 e y=3