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2x+y = 48 ......... II
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4x = 68
x = 68 / 4
x = 17 ......... III
III en I
2x - y = 20
2(17) - y = 20
34 - y = 20
34-20 = y
14 = y
CS= (17; 14)
1) 2x - y = 20
2) 2x + y = 48
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4x + 0y =68
4x = 68
x = 68/4
x = 17
El valor de x reemplazo en ecuación 2
2x + y = 48
2 (17) + y = 48
34 + y = 48
y = 48 - 34
y =14
Solución.
x = 17
y = 14