Respuesta:
Explicación paso a paso:
1) x+y=3
x-y = 7
------------ Suma
2x = 10
x = 5
.Reemplaza (1)
5 + y = 3
y = -2
2) x-2y = 3 ..(x2) 2x-4y=6
2x- 3y = 20
------------------- restar
-4y - (-3y) = -17
-y = -17
y = 17
.reemplaza (2)
2x - 3(17) = 20
2x = 20+41 --- x=61/2
3)
-2x+y=4...(x3)
6x-3y=12
----------
no me alcanza tiempo
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Respuesta:
Explicación paso a paso:
1) x+y=3
x-y = 7
------------ Suma
2x = 10
x = 5
.Reemplaza (1)
5 + y = 3
y = -2
2) x-2y = 3 ..(x2) 2x-4y=6
2x- 3y = 20
------------------- restar
-4y - (-3y) = -17
-y = -17
y = 17
.reemplaza (2)
2x - 3(17) = 20
2x = 20+41 --- x=61/2
3)
-2x+y=4...(x3)
6x-3y=12
----------
no me alcanza tiempo