Question

resolva { 4x-y=12
{6x+2y=14

Answer 1

{4x—y=12 (2)
{6x+2y=14

{8x—2y=12
{6x+2y=14 reduz 2y e —2y

{8x=12
{6x=14

14x=26
x=26/14
x=13/7

Substituímos o valor de x numa outra equacão.
4x—y=12
4(13/7)—y=12
52/7 —y=12
—y=12—52/7
—y=(84—52)/7
—7y=84—52
—7y=32 (—1)
7y=—32.
y=—32/7


bons estudos!!!

Answer 2

4x - y  = 12
6x + 2y = 14
-----------------
10x + y = 26
10x = 26 -y
x = 26-y / 10

4 * (26-y/10)-y = 12

104-4y /10-y =12
104-4y - 10y /10 = 12
104-4y -10y = 120
-4y - 10y = 120- 104
-14y = 16
y = 16 / -14  simplificando por 2
y= -8/7

x= 26 - y / 10 
x= 26- (-8/7)÷10
x= 26 + 8/7 ÷ 10
x= (182+8) /7  ÷ 10
x= 190/ 70 simplificando por 10
x= 19/ 7