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metodo de adicion y sustraccion
adision o suma
x+2y=6
x+4y=3
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2x+6y=9
sustraccion o resta
x+2y=6
-x-4y=-3
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//-2y=3
y=3/2
2) x + 4y = 3 (1)
- x - 2y = - 6
x + 4y = 3
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0x + 2y = - 3
2y = - 3
y = - 3/2
Reemplazo el valor de y en ecuación 1
x + 2y = 6
x + 2 (- 3/2) = 6
x - 6/2 = 6
x - 3 = 6
x = 6 + 3
x = 9
x = 9
y = - 3/2