2 ordered pairs are needed to calculate slope.
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The symbol for an ordered pair is (x,y).
The inverse of an ordered pair (a,b) is the pair (b,a). So you simply switch the order.
point-slope form looks like... y-y1=m(x-x1) these parts stay the same.... y- = (x- ) and you plug in the ordere4d pair you are given into it. So if the ordered pair is (2,3) (x,y) it will be y-3=m(x-2)
The second number in an ordered pair (x,y) is the y-coordinate for that point.
(1,2)