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Write the line touching y = √x at the point (4, 2).
Ax − 4y + 4 = 0
B4x − y = 14
Cx − 4y = 4
Dx + 4y = 4
Answer & Solution
Correct answer: A. x − 4y + 4 = 0
The slope 1/(2√x) is 1/4 at x = 4, so y − 2 = (x − 4)/4, which rearranges to x − 4y + 4 = 0.
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