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anonymous
 one year ago
The points 1,r and −3,1 lie on a line with slope
−1 Find the missing coordinate r.
anonymous
 one year ago
The points 1,r and −3,1 lie on a line with slope −1 Find the missing coordinate r.

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MrNood
 one year ago
Best ResponseYou've already chosen the best response.4do youknow how to work out the slope of a line betwee 2 points?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0No can you teach me?

MrNood
 one year ago
Best ResponseYou've already chosen the best response.4dw:1443312124889:dw the slope is the steepness of the line it is calculated from the 2 points like this: \[slope = \frac{ y _{2}y _{1} }{ x _{2}x _{1} }\]

MrNood
 one year ago
Best ResponseYou've already chosen the best response.4in your question you have the 2 points (1,r) & (3,1) and you know th eslope is 1 so put the numbers that you know into the equation you then need to arrange it to work out r

MrNood
 one year ago
Best ResponseYou've already chosen the best response.4dw:1443312430012:dw use the equatin and the numbers  you can then work out r
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