Mathematics for IGCSE & O level - Sketching Curves (Section 2 - No. 49)
Which of the following equations does NOT represent a function?
y = x
y = x²
y = 2^x
x² + y² = 1
Explanation
The equation of a circle (x² + y² = 1) does not represent a function since one x-value can produce two y-values.
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