Question

Método por sustitución:
2x + 5y = 11
4x - 3y = -4

x + y = 11
X-y = -1

x + 3y = 2
3x - y = 2
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Answer 1

Explicación paso a paso:

2x+5y=11

4x-3y=-4

4x-3y=-4

4x=-4+3y/4

x=-4+3y/4

2*(-4+3y/4)+5y=11

-8+6y/4+5y=11

-8+6y/4+20y/4=11

-8+26/4=11

-8+26y=44

26y=52

y=2

2x+5*2=11

2x=11-10

2x=1

x=1/2

2)

x =11-y

11-y-y=-1

-2y=-12

2y=12

y=12/2

y=6

x+y=11

x+6=11

x=5

3)x=2-3y

3*(2-3y)-y=2

6-9y-y=2

6-10y=2

-10y=-4

10y=4

y=4/10

x+3*4/10=2

x+12/10=2

x=2-12/10

x=20/10-12/10

x=8/10