SOLUTION: Determine the value(s) of t if P(-3;7), Q(5;-9) and R (-2;t ) are co-linear.

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Question 755311: Determine the value(s) of t if P(-3;7), Q(5;-9) and R (-2;t ) are co-linear.
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
collinear lines have the same slope so...

%0D%0A%0D%0Am=%28-9-7%29%2F%285-%28-3%29%29=%28t-7%29%2F%28-2-%28-3%29%29%0D%0A

which gives us t=5



graphing is actually much easier, but relies on precision and accuracy
:)