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I'm pretty sure it's undefined meaning it is a vertical line.

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No, it is not. It is a horizontal line, 1 unit above the x-axis. Its slope-intercept equation can be written as y = 0x + c : that is, slope = 0, intercept = 1.

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12y ago
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13y ago

Y= -1 is graphed as a horizontal line throughout the entire graph at -1

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Q: How do you graph y equals -1?
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