plot the points (5,-1), (1,-1), and (-3,-1). What is the equation of the line that goes through these points?​

Using the point-slope form of the equation of a line:  y−y1=m(x−x1) , or the two-point form:  y−y1=y2−y1x2−x1×(x−x1) , won’t help you here because all the x-values are the same. (Therefore x₂-x₁ or x-x₁ will give a zero denominator, which is Not To Be.)

If all of the coordinates of one type (x or y) are the same, you know you have either a horizontal or a vertical line.

Horizontal lines all have the same y-value, so their equations are of the form y = n, where n is some number (not a variable).

Vertical lines all have the same x-value, so their equations are of the form x = m, where m is some number (also not a variable).

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step-by-step explanation: