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How is the y-intercept of a quadratic function found?

ABy substituting x equal to 0
BBy substituting y equal to 0
CBy halving the coefficient a
DBy factoring the constant term
Answer & Solution
Correct answer: A. By substituting x equal to 0
1. The y-intercept is where the graph crosses the vertical axis. 2. Every point on that axis has an x-coordinate of 0. 3. So substitute 0 for x and work out the output. 4. Substituting 0 for the output instead would find the x-intercepts. _Source: OpenStax Intermediate Algebra (CC BY 4.0), section 9.6 Graph Quadratic Functions Using Properties_
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