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Write the equation of the line in slope-intercept form if possible: thru the point (-1, 6) with an undefined slope.

User MaTePe
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"undefined slope" tells you immediately that the line is a vertical one.  It has no y-intercept.  Its horiz. intercept is -1.  Thus, the eq'n of this line is merely x=-1.
User Samim Hakimi
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