y - y1 = ((y2 - y1) / (x2 - x1))(x - x1)
Substituting the known values,
y - 1 = ((4 - 1) / (0.5 - 0.5))(x - 0.5)
The denominator of the slope of the line is 0, making the slope undefined. The line is therefore vertical and its equation is x = 1/2.
two points with an undefined slope, means a vertical line, check the picture below.
it is A
hope this helps
the correct answer
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