Question

3. Resolver
2x + y = 3
y+x=2
Indicar: XyY
a) 1
b) 2
c) 3
d) 0
e) -1​

Answer 1

Respuesta:

2x+y=3

Y+x=2. × (-2)

2x+y=3

-2x-2y=-4

-y=-1. x+y=2

1=y. x+1=2

x=1

Answer 2

2x+y=3

Y+x=2. × (-2)

2x+y=3

-2x-2y=-4

-y=-1. x+y=2

1=y. x+1=2

x=1