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How many lattice points (points with integer coordinates) are on the line segment whose endpoints are $(3,17)$ and $(82,150)?$ (Include both endpoints in your count.)

 Jul 23, 2024

Best Answer 

 #1
avatar+1926 
+1

First, let's figure out the slope of the two points. 

Since the slope is \(\frac{y_2-y_1}{x_2-x_1}\), the slope for (3,17) and (82,150) is

\(\frac{150-17}{82-3} = \frac{133}{79}\)

 

However, notice that between the two points, there are no lattice points. 

This is because following the slope, after (3, 17), the next latice point is

 

\((3+79, 17+133) = (82, 150)\)

 

Thus, the two endpoints are the only latice points, there are 2. 

 

Thanks! :)

 Jul 23, 2024
edited by NotThatSmart  Jul 23, 2024
 #1
avatar+1926 
+1
Best Answer

First, let's figure out the slope of the two points. 

Since the slope is \(\frac{y_2-y_1}{x_2-x_1}\), the slope for (3,17) and (82,150) is

\(\frac{150-17}{82-3} = \frac{133}{79}\)

 

However, notice that between the two points, there are no lattice points. 

This is because following the slope, after (3, 17), the next latice point is

 

\((3+79, 17+133) = (82, 150)\)

 

Thus, the two endpoints are the only latice points, there are 2. 

 

Thanks! :)

NotThatSmart Jul 23, 2024
edited by NotThatSmart  Jul 23, 2024

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