Question

porfa es urgente
ECUACIONES
1) 4x -2y =2
2x + 2y =10

2)6x - 2y =12
x + y = 7

3) 6x -2y= -8
5x+4y=5

4)2x-3y =-7
5x +y=-9

5) x + 3y=-11
-2x+4y=-2

6)-4x + 5y =7
2x + y =7

7)6x -2y=-8
5x + 4y= 33

8) 3x +5y=7
2x -y=9

9) 4x -2y=8
3x +y=2

10) x -6y =27
7x -3y=9

11) 3x+5y=7
2x -y =-4

12)2x+y=8
x -4y=-5

Answer 1

Explicación paso a paso:

1) 4x -2y =2

2x + 2y =10

4 x - 2 y = 2

2y = 10-2x

4x-(10-2x) = 2

x = 2

2y = 10-2×2

y = 3

(x,y)=(2,3)

2) 6x - 2y =12

x + y = 7

6 (7 - y) -2y = 12

y = 7 - 15 / 4

x = 13 / 4

( x , y ) = ( 13 / 4 , 15 /4 )

3) 6x -2y= -8

5x+4y=5

x = - 4/3 + 1/3 y

5x + 4y = 5

5(-4/3 + 1/3 y ) + 4y = 5

y= 35/17

x= -4/3 + 1/3 × 35 / 17

x= -11/17

( x , y ) = ( - 11 / 17 , 35 / 17 )

4) 2x-3y =-7

5x +y=-9

2x-3y = -7

y=-9-5x

2x-3-9-5x)= =-7

x = -2

y=-9-5x (-2)

y=1

(x ,y)=(-2 , 1)

5) x + 3y=-11

-2x+4y=-2

-2(-11-3y) + 4y = -2

y= - 12/5

x=-11-3x(-12/5)

x= - 19/5

(x,y)=( -19/5 , - 12/5 )

6) -4x + 5y =7

2x + y =7

-4x+5 (7-2x)=7

x = 2

y=7-2×2

y = 3

(x, y) = (2,3)

7) 6x -2y=-8

5x + 4y= 33

x= - 4/3 + 1/3 y

5x + 4y = 33

5(-4/3 + 1/3 y ) + 4y = 33

y = 7

x= - 4/3 + 1/3 × 7

x= 1

(x,y)=(1,7)

8) 3x +5y=7

2x -y=9

3x+5(-9+2x)=7

x = 4

y=-9+2×4

y= - 1

(x,y)=(4,-1)

9) 4x -2y=8

3x +y=2

4x - 2(2 - 3x) = 8

x= 6/5

y=2-3 x 6/5

y= - 8/5

(x , y)=(6/5 , - 8/5)

10) x -6y =27

7x -3y=9

7 (27+6y) - 3y=9

y= - 60/13

x = 27+6 x ( - 60/13 )

x= - 9/13

(x,y)=(-9/13 , - 60/13)

11) 3x+5y=7

2x -y =-4

3x+5 (4+2x)=7

x = -1

y= 4+2 × (-1)

y= 2

(x,y)=(-1 , 2)

12) 2x+y=8

x -4y=-5

x-4(8-2x) = -5

x = 3

y=8-2×3

y = 2

(x,y)=(3,2)

Espero que te ayude .