Hello : let
A(5,22) B(2,13)
the slope is : (YB - YA)/(XB -XA)
(13-22)/(2-5) = -9/-3
an equation is : y=ax+b a is a slope
y = 3x +b
the line through point A (5,22) :
22 = 3(5)+b
b = 7
the equation is : y =3x+7
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