document.write( "Question 1045547: do the given points lie in a straight line? (-2,2), (5,-8), (-7,9) \n" ); document.write( "

Algebra.Com's Answer #660998 by Boreal(15235) $\"\"$ $\"About$

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Look at the slope between the first and second, and the second and the third. If they are in a straight line, the slopes will be equal.
\n" ); document.write( "-8-2/5-(-2)=-10/7=-1.43
\n" ); document.write( "9-(-8)/(-7-5)=17/-12. They aren't equal.=-1.42
\n" ); document.write( "As a check, look at the first and third.
\n" ); document.write( "(9-2)/(-7-(-2))=7/-5=-1.4
\n" ); document.write( "None of these is the same, although they are close. This isn't linear.
\n" ); document.write( "Here's a graph of the first and third points.
\n" ); document.write( " $\"graph%28300%2C200%2C-10%2C10%2C-10%2C10%2C%28-7x%2F5%29-%284%2F5%29%29\"$ \n" ); document.write( "

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