That refers to the three coordinates in space.
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y-y1=m(x-x1) m is the slope x1 is x of the given point y1 is y of the given point y stays as y x stays as x ex: P(1,2) m=2 y-2=2(x-1)
What is the next letter? A Z B Y C X D
(y * x) - y = y * (x - 1)
y axis ___________________________________ The letters X, Y and Z often refer to unknown or "variable" quantities, and the purpose of solving the algebra problem is to determine the precise value of these variables.