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2x- y = -4
Método de reducción
-2(3x + 5y = 7)
3(2x- y = -4)
-6x-10y=-14
6x-3y=-12
---------------------
//-13y=-26
13y=26
y=26/13
y=2
6x-3y=-12
6x-3(2)=-12
6x-6= -12
x=(-12+6)/6
x= -6/6
x= -1
Saludos....
2)2x- y = -4
despejamos en uno
3x=7-5y
x=(7-5y)/3
remplazamos en 2
2((7-5y)/3)- y = -4
((7-5y)/3)- y = -4/2
7-5y-3y/3=-2
7-5y-3y=-2(3)
7-8y=-6
-8y=-6-7
-y=-13/8
y=13/8
remplazamos en 1
3x + 5y = 7
3x+5(13/8)=7
3x+65/8=7
3x=7-(65/8)
3x=(56-65)/8
3x=-9/8
x=(-9/8)/3
x=-9/24