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Paper 2 · Functions and Graphs

The graph y=f(x)y=f(x) has yy-intercept (0,16)(0,16). State the yy-intercept of y=−12f(x)y=-\tfrac12f(x).

Model answer

(0,-8)

Also accepted: 0,-8, -8

Explanation: Scaling by −12-\tfrac12 gives the new yy-intercept −12×16=−8-\tfrac12\times16=-8, so (0,−8)(0,-8).

Derived from ZIMSEC Pure Mathematics Paper 2, November 2025, Q2

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