# Math Assignment Help With The Y-Intercept

## 4.4 The y-intercept

y-intercept occurs where the input, or value of x is equal to zero.

For example:

y = x2 + 2x -15

x2 – 3x - 18

Now, putting x = 0 we get:

y = (0)2 + (0) – 15

(0)2 + (0) – 18

y = -15

-18

y = 5

6

y = 0.83

That is, the graph crosses the y-axis at y = 5/6 or 0.83.

Notice that when you express the polynomials of a rational function in standard form, then the y-intercept is simply the ratio of the final terms for the two polynomials.

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