Example

Finding the Equation of a Horizontal Line Through (−1,4)(-1, 4)

To determine the equation of a horizontal line that contains the point (−1,4)(-1, 4), apply the point-slope method.

Step 1 — Identify the components: The slope of any horizontal line is m=0m = 0, and the specific point is (x1,y1)=(−1,4)(x_1, y_1) = (-1, 4).

Step 2 — Substitute into the point-slope form y−y1=m(x−x1)y - y_1 = m(x - x_1): y−4=0(x−(−1))y - 4 = 0(x - (-1))

Step 3 — Simplify: Expanding and multiplying by zero yields: y−4=0y - 4 = 0 y=4y = 4

The final equation of the line is y=4y = 4.

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Updated 2026-06-03

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