Algebra.Com's Answer #114701 by Adam(64)![\"\"](\"/images/stars/stars-08.gif\")   You can put this solution on YOUR website! First we need to get it into standard form which is Ax+B=0 \n" ); document.write( "21-7x = 18+x //-x \n" ); document.write( "21-8x = 18 //-18 \n" ); document.write( "3-8x = 0 //reorder \n" ); document.write( "-8x+3 = 0 //*(-1) (looks better ;} ) \n" ); document.write( "8x-3 = 0\r \n" ); document.write( "\n" ); document.write( "The equation of the form Ax+B=0 has slope A, what does B value does ? Well, as you see from the equation B adds constant value at every point, thus B moves the line upp or down (if B is negative), A rotates the line (every point is multiplied by that number) and by rotation alone we can increase or decrease slope. \n" ); document.write( "There is also alternative definition, so let's check it. \n" ); document.write( "Slope = f(x2) - f(x1) / x2 - 1 \n" ); document.write( "let x1 = 1 and x1 = 3 \n" ); document.write( "(x is independent variable so you can choose any value you want) \n" ); document.write( "( f(x1) is left hand of our equation suplied with x1) \n" ); document.write( "{(8*3 - 3) - (8*1 - 3)} / (3 - 1) = 8\r \n" ); document.write( "\n" ); document.write( "you can try it also for other values if you want ;}\r \n" ); document.write( "\n" ); document.write( "Cheers, \n" ); document.write( "Adam \r \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( " \n" ); document.write( "\n" ); document.write( " \n" ); document.write( " |