Answer:
y = 4
Explanation:
You want the equation of the horizontal line containing the point (-1, 4).
Horizontal line
On a horizontal line, the y-coordinates of every point are the same. The equation can be written ...
y = constant
Application
In order for the horizontal line to go through a point with y-coordinate 4, the constant must be 4. The equation is ...
y = 4
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