Equation of the line passing through (1, -9) and (1, 12) is y = -9
The equation to the line in slope intercept form
y = mx + c
where
m = slope
c = intercept
x = input variables
y = output variables
calculation of slope, m for (1, -9) and (1, 12)
(y - y₁) / (x - x₁) = m
m = (-9 - 12) / (1 - 1)
m = 1 / 0
m = undefined slope (this is the slope of vertical line)
equation of the line (1, -9)
(y - -9) = 0
y + 9 = 0
y = -9
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