Question

Me ayudan xfa ^ ^ son ecuaciones lineales con método de suma y resta, porfavor si no sabes no contestes, me urge :(((

1.-
2x+3y= 13
3x-+2y= 12


2.-
5x-y= -10
3x+2y= -6


3.-
3x+4y= 11
9x+12y= 33

Answer 1

Respuesta:

1: x=2 y=3

2: x=-2 y=0

3: x=3.6 y=0

Explicación paso a paso:

1:

2x+3y=13

2x=13-3y

x=13-3y/2

3x+2y=12

3x=12-2y

x=12-2y/3

13-3y/2=12-2y/3

2(12-2y)=3(13-3y)

24-4y=39-9y

-4y+9y=39-24

5y=15

y=15/5

y=3

2x+3(3)=13

2x+9=13

2x=13-9

2x=4

x=4/2

x=2

2:

5x-y=-10

5x=-10+y

x=-10+y/5

3x+2y=-6

3x=-6-2y

x=-6-2y/3

-10+y/5=-6-2y/3

5(-6-2y)=3(-10+y)

-30-10y=-30+3y

-10y-3y=-30+30

-13y=0

y=0/-13

y=0

5x-0=-10

5x=-10-0

5x=-10

x=-10/5

x=-2

3:

3x+4y=11

3x=11-4y

x=11-4y/3

9x+12y=33

9x=33-12y

x=33-12y/9

3(33-12y)=9(11-4y)

99-36y=99-36y

-36y+36y=99-99

y=0

3x+4(0)=11

3x+0=11

3x=-11-0

3x=11

x=11/3

x=3.6