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x = largo
y = ancho
Perímetro:
x+ y + x + y = 2x + 2y = 128
Su largo tiene 6 pulgadas menos que 4 veces su ancho:
x = 4y - 6
Resuelves tu sistema de ecuaciones:
2x + 2y = 128
x = 4y - 6
2x + 2y = 2(4y - 6) + 2y = 128
8y -12 + 2y = 128
10y = 128 + 12 = 140
y = 140/10 =14
y = 14
x = 4y - 6 = 4(14) - 6
x = 56 - 6
x = 50
Saludos!