How could you find an equation of a quadratic function with the zeroes of -3 and 1?
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The y-intercept is the point where the graph crosses the y-axis. It is found by setting x=0. For your equation, that makes the x-term vanish and only the constant remains. The ordered pair is ...
(x, y) = (0, -9)
(x, y) = (0, -9)