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ii) (x - 15)/(y + 20) = 3/7; Entonces: 7x - 105 = 3y + 60; entonces: 7x - 3y = - 165
Resolviendo el sistema:
10x - 9y = 0
(Mult. por -3) 7x - 3y = -165
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10x - 9y = 0
-21x + 9y = - 495
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- 11 x = -495
x = 45
Por lo tanto: y = 50
Entonces: 45 + 50 = 95