2D probability integral question

nhrock3
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the question and solution
after i they find the total interval of the total function
i can't understand
what they do with the graph and how they derive the integrals from it
?
2jc983a.gif

2lc1c93.gif
 
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how to we know that x1x2<t is bellow this line
how to we know that x1x2>t is above this line
 

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