Question

3. Resolver:
-7x + 11y = 25
2x + 3y = -1
Indicar el valor de "x".
a) -3 b) -2 c) -1 d) 3 e) 2

Answer 1

Respuesta:

el valor de x:

1) despeja x

2x + 3y = -1

2x= -1 -3y

x= -1-3y/2

2) Reemplaza x:

-7x + 11y = 25

-7(-1-3y/2) + 11y = 25

3) Resolver:

-7(-1-3y/2) + 11y = 25

-7(-1-3y) + 22y = 25

-7 -21y + 22y = 25

-21y + 22y = 25 + 7

y= 32

4) Reemplaza y

2x + 3y = -1

2x+ 3(32) = -1

2x + 93= -1

2x= -1 -93

2x= -94

x= -94/2          x= -47