Identifying the Y intercept from a Graph
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Identifying the Y intercept from a Function Rule If y = 3x + 5, the y intercept is 5 because when x = 0, y = 3(0) + 5 = 5. If y = 7x2 + 5x -3, the y intercept is -3 because when x = 0, y = 7(0) + 5(0)-3 = -3. If y = 2x +4, the y intercept is 4 because when x = 0, 20 + 3 =4. Important Fact: For all the polynomial functions, the y intercept is the constant term.
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CONCEPT CHECK: The y intercept of the function: x3 +5x - 9 is: