Question

Método de reducción

2x+4y=28
6x+3y=39​

Answer 1

y=3, X=8

(3)2x+4y=84(3) = 6x+12y=84

(4)6x+3y=39(4)=24x+12y=156

30 × +0y=240

x=240/30

x=8

6x+12y=84

6(8)+12y=84

48+12y=84

12y=84-48

12y=36

y=36/12

y=3

comprobación

6x+12y=84

6(8) + 12(3)=84

48+36=84

84=84

24x-2y=156

24(8)-12(3)=156

192-36=156

espero te ayude

Answer 2

2x+4y=28.....(1)

6x+3y=39.....(2)

(1) x (-3):

(-3)(2x+4y)=(-3)(28)

- 6x -12y= - 84...(3)

(2) x (4):

(4)(6x+3y)= (4)(39)

24x+12y= 156...(4)

(3) + (4):

18x = 72

x = 72/18

x = 4

x en (1):

2(4)+4y = 28

8 + 4y = 28

4y = 28 - 8

4y = 20

y = 20/4

y = 5