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x 2 - 16 = 0 y 2 - 9y + 20 = 0

Correct Answer: if x ≤ y

Explanation:

x2 - 16 = 0
⇒ x2 = 16 ⇒ x = √16 = ± 4
and y2 - 9y + 20 = 0
y2 - 4y - 5y + 20 = 0
⇒ y(y - 4) - 5(y - 4) = 0
⇒ y = 5, 4
⇒ y ≥ x or x ≤ y


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