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x/y = 6....... (1)
x*y = 54...... (2)
De (1) despejas x:
x = 6y
Sustituyes en (2):
6y*y = 54
6y² = 54
y² =54/6 = 9
y = √ 9 = 3
y = 3
Sustituyes este valor en (1)
x/y = 6
x/3 = 6
x = 6*3 = 18
x = 18