document.write( "Question 257343: I can't seem to understand how to write equations of lines. I know its a pretty vague questions but I honestly need your help with it or I might fail the class and my HSA \n" ); document.write( "
Algebra.Com's Answer #189271 by dabanfield(803)\"\" \"About 
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I can't seem to understand how to write equations of lines. I know its a pretty vague questions but I honestly need your help with it or I might fail the class and my HSA\r
\n" ); document.write( "\n" ); document.write( "I'll try to help:\r
\n" ); document.write( "\n" ); document.write( "For a point (x,y) to be on a line, x and y must be related in this way:\r
\n" ); document.write( "\n" ); document.write( "ax + by + c = 0 where a, b and c are constants. This representation for the equation of the line is called the standard form of a line. Another way to represent the relationship is through what is called the slope-intercept form of a line which is:\r
\n" ); document.write( "\n" ); document.write( "y = mx + b. In this alternative repesentation m is the slope of the line and b is the value of y when x = 0 or the value of y when the line the crosses the y axis.\r
\n" ); document.write( "\n" ); document.write( "If substituting the values for x and y of a point (x,y) does not make the line equation true then the point is not on the line.\r
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