Question

Resolva O método da substituição :
X+2y=4
7x-2y=12

Answer 1

2y = 4 - x

7x - 2y  = 12
7x - 4-x = 12
6x - 4 = 12
6x = 12 +4
16/6 = x

x = 2,67

2y = 4 - x
2y = 4 - 2,67
1,33/ 2 = y
y = 0,66

Answer 2

X+2y=4
7x-2y=12 ---> 7X - 12 = 2Y

X + 7X - 12 = 4
8X = 4 +12
8X = 16 -> X =2


7X - 12 = 2Y

7. 2 -12 = 2Y
14 - 12 = 2Y
2Y = 2
Y =1