Question

Resolva os sistemas:

A) {2x+4y=48
     {3x+2y=48

B) {x+y=2
     {4x-2y=5

C) {2x+3y=1
     {2x+5y=-1

D) {5x+y=-4
     {2x-y=-5

Answer 1

a) 2x+4y=48
3x+2y=48×2

2x+4y=48
+6x+4y=96
8x corta os dois 4y=96
8x=96
x=96÷8
x=12

2×12+4y=48
24+4y=48
4y=48-24
4y=24
y=24÷4
y=6