document.write( "Question 833053: The line a(12,x) and b(x,8) has a slope of -3/7 what is the value of x. How do I find it?
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #502279 by MathTherapy(10552) $\"\"$ $\"About$

You can put this solution on YOUR website!
The line a(12,x) and b(x,8) has a slope of -3/7 what is the value of x. How do I find it?

We will change coordinate point a from (12, x) to (12, X), and coordinate point b from (x, 8) to (X, 8)
\n" );
document.write( "to avoid confusion
\n" );
document.write( "Formula for slope, or , where:
\n" );
document.write( "
\n" );
document.write( "
\n" );
document.write( "
\n" );
document.write( "
\n" );
document.write( "Therefore,  becomes:  
\n" );
document.write( "7(X - 8) = - 3(12 - X) ------ Cross-multiplying
\n" );
document.write( "7X - 56 = - 36 + 3X
\n" );
document.write( "7X - 3X = - 36 + 56
\n" );
document.write( "4X = 20
\n" );
document.write( ", or 
\n" );
document.write( "You can do the check!! \r
\n" );
document.write( "\n" );
document.write( "Send comments, “thank-yous,” and inquiries to “D” at MathMadEzy@aol.com.
\n" );
document.write( "Further help is available, online or in-person, for a fee, obviously.  \n" );
document.write( "

\n" );