Respuesta :

y varies directly with x.
⇒ y = ky where k is a constant.

Given that x = 4 when y - 26,
26 = 4k
k = 6.5 

Therefore 
⇒ y = 6.5x

When y = 65,
65 = 6.5x
x = 10

Answer: x = 10

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