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Reciprocal Graphs Flashcards
GCSE Mathematics (Edexcel) 1MA1
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Reciprocal graph
A graph of the function y = 1/x, which has two branches and asymptotes at x = 0 and y = 0.
Equation of a basic reciprocal graph
y = 1/x, where x ≠ 0.
Asymptotes of y = 1/x
The graph has vertical asymptote at x = 0 and horizontal asymptote at y = 0.
Shape of y = 1/x
The graph has two branches: one in the first quadrant and one in the third quadrant.
Effect of negative reciprocal (y = -1/x)
The graph is reflected in the x-axis compared to y = 1/x, with branches in the second and fourth quadrants.
Transformations of y = 1/x
Adding or subtracting a constant (e.g., y = 1/x + c) shifts the graph vertically.
Graph of y = k/x
The graph is a reciprocal graph where k determines the steepness and direction of the branches.
Key points on y = 1/x
For x = 1, y = 1; for x = -1, y = -1; for x = 2, y = 0.5; for x = -2, y = -0.5.
Domain of y = 1/x
All real numbers except x = 0 (x ≠ 0).
Range of y = 1/x
All real numbers except y = 0 (y ≠ 0).

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