Question

me ajudem com esta equação ; x + y=14
4x +2y=48

Answer 1

x + y = 14    (a)
4x + 2y = 48   (b)

Multiplique (a) por 4:

4x + 4y = 56    (a)
4x + 2y = 48   (b)

Subgtraia (a) - (b):

2y = 8
y = 4

Logo x = 10

Answer 2

{x+y=14
{4x+2y=48
x=14-y
4(14-y)+2y=48
56-4y+2y=48
-4y+2y=48-56
-2y=-8.(-1)
2y=8
y=8/2
y=4
x=14-y
x=14-4
x=10
S={(10, 4)}