document.write( "Question 6794: I am having a real hard time with algebra and need help with the following problem:\r
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document.write( "Find the equation for the line that passes through the indicated pair of points\r
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document.write( "(-2,-2)and(7,25)\r
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document.write( "Thanks for being there when needed \n" );
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Algebra.Com's Answer #3740 by prabhjyot(165) ![]() You can put this solution on YOUR website! the line that passes through the points(-2,-2)and(7,25) \n" ); document.write( "Equation of a straight line is y=mx+c --->(1) \n" ); document.write( "where m is the slope of the line \n" ); document.write( "T0 find slope we use the formula \n" ); document.write( "m = y1-y2/x1-x2\r \n" ); document.write( "\n" ); document.write( "Given:(x1,y1)= (-2,-2)\r \n" ); document.write( "\n" ); document.write( " (x2,y2) = (7,25)\r \n" ); document.write( "\n" ); document.write( "putting these values in the formula \r \n" ); document.write( "\n" ); document.write( "m= -2-25/-2-7 \n" ); document.write( " = -27/ -9 \n" ); document.write( "m=3\r \n" ); document.write( "\n" ); document.write( "putting the value of m in equation (1) \n" ); document.write( "we get \n" ); document.write( " y=3x+c \n" ); document.write( "Now we donot have the value of c( which gves the y-intercept) \n" ); document.write( "To find the value of c we will plug in the value of m and x and y from any particular point say (-2,-2)\r \n" ); document.write( "\n" ); document.write( "-2 = 3(-2)+c \n" ); document.write( "-2 +6 =c \n" ); document.write( "4 =c \n" ); document.write( "so c =4 \n" ); document.write( "then the equation of line must be y=3x+4 \n" ); document.write( " \n" ); document.write( " |