Question

Resolva os sistemas a seguir:

(a)x+y=1860
x-y=780

(b)x+y=450
x-y=240

(c)2x+y=280
x-y=200​

Answer 1

Resposta:

a)×+y=1860

×-y=780

2×=2640

×=1320

b)×+y=450

×-y=240

2×=210

×=105

c)2×+y=280

×-y=200

3×=480

×=160