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| 1. |
\begin{array} { c } { \text { If the points } A ( a , 0 ) , B ( 0 , b ) \text { and } P ( x , y ) \text { are collinear, using slopes, prove thal } } \\ { \frac { x } { a } + \frac { y } { b } = 1 } \end{array} |
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