Question

2x-3y=11 2x+7y=1qual a resposta ?

Answer 1

2x-3y=11

2x+7y=1

2x = 11 + 3y

x = (11 + 3y)/2

2x+7y=1

2(11 + 3y)/2 + 7y = 1

11 + 3y + 7y = 1

11 + 10y = 1

10y = -10

y =-1

2x - 3y = 11

2x -3.-1 = 11

2x + 3 = 11

2x = 8

x = 4

S={4,-1}

Answer 2

2x-3y= 11
2x+7y= 1
--------------------------------
2x-3y= 11
2x= 11+3y
x=(11+3y)/2

2x+7y= 1
2.(11+3y)/2+7y= 1
11+3y+7y = 1
10y= 1 - 11
10y= -10
y= -10/10
[y= -1]

x= (11+3y)/2
x= (11+3.(-1))/2
x= (11-3)/2
x= 8/2
[x=4]

S=[4,-1]

Espero ter ajudado!!!