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JAMB - Mathematics (1982 - No. 45)

If K is a constant, which of the following equations best describes the parabola?
y = kx2
x = y2 - k
y = k - x2
x2 = y2 - k
y = (k - x)2

解释

The parabola is best described by the equation x = y2 - k because all other equations do not give the equation of the parabola in this position. C for example is the equation of a hyperbola facing downwards. D is the equation of a hyperbola A and E are equations of parabola facing upwards

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