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

Tuesday, June 4, 2013

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

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

%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
:)

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