Question

Resolva os sistemas :
a) 2x+2y=12
4x - 2y = 48

b) 4x+2y=10
6x-2y=10


c) 4x+10y=28
2x=2y

d) 2x=2y+6
8x+2y=-6

e) 2x=10y
2x+2y=24

Por favor me deem a resposta com cálculo. Obrigada

Answer 1

a) 2x + 2y = 12
4x- 2y = 48
___________
6x = 60
x = 60/6
x = 10
b) 4x + 2y = 10
6x - 2y. = 10
__________
10x = 20
x = 20 / 10
x = 2

c) 4x + 10y = 28
2x = 2y

4x. + 10y = 28
2x - 2y = 0 ( 5 )

4x + 10y = 28
10x - 10x = 0
__________
14x = 28
x = 28/14
x = 2

d) 2x = 2y + 6
8x + 2y = - 6
___________
2x - 2y= 6
8x + 2y - 6
10x = 0
x = 0 /10
x = 0

e) 2x = 10y
2x + 2y = 24.

2x - 10y = 0
2x + 2y = 24 ( 5 )

2x - 10y = 0
10x + 10y = 120
____________
12x = 120
x = 120/12
x = 10

Answer 2

Resposta:

resposta correta 4× (12)=48