anonymous
  • anonymous
The points 1,r and −3,1 lie on a line with slope −1 Find the missing coordinate r.
Mathematics
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SOLVED
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katieb
  • katieb
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MrNood
  • MrNood
do youknow how to work out the slope of a line betwee 2 points?
anonymous
  • anonymous
No can you teach me?
MrNood
  • MrNood
|dw:1443312124889:dw| the slope is the steepness of the line it is calculated from the 2 points like this: \[slope = \frac{ y _{2}-y _{1} }{ x _{2}-x _{1} }\]

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MrNood
  • MrNood
in 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
  • MrNood
|dw:1443312430012:dw| use the equatin and the numbers - you can then work out r

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