ki where i is the unit horizontal vector, and k is any number.
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Undefined slopes belong to lines that are vertical. These lines do not cross the y-axis, but do cross the x-axis. Therefore, the equation for these lines are always: x = # (where # is the value at which the line is crossing the x-axis).
y=-2.5 is parallel to the x axis. The equation of the x axis is y=0
[ y = plus or minus any number ] is parallel to the x-axis.
X=-b/2a
x=4