document.write( "Question 258403: find the equation of a line that passes through 4,8 and -3-6 my problem is when she asked questions like this one how do you now which formula to use thank you \n" ); document.write( "
Algebra.Com's Answer #190229 by CharlesG2(834)\"\" \"About 
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find the equation of a line that passes through 4,8 and -3-6 my problem is when she asked questions like this one how do you now which formula to use thank you\r
\n" ); document.write( "\n" ); document.write( "the equation of a line is y=mx+b, where m is the slope, and b is the y-intercept (sometimes called the verical intercept), b is the point (0,b)\r
\n" ); document.write( "\n" ); document.write( "m=(y2-y1)/(x2-x1) or the rise/run\r
\n" ); document.write( "\n" ); document.write( "am hoping -3-6 means (-3,-6)\r
\n" ); document.write( "\n" ); document.write( "y=((-6-8)/(-3-4))x+b
\n" ); document.write( "y=(-14/-7)x+b
\n" ); document.write( "y=2x+b\r
\n" ); document.write( "\n" ); document.write( "2=(y2-y1)/(x2-x1)=(8-y1)/(4-0) (solving for y1 which will be b)
\n" ); document.write( "2=(8-y1)/4 ; 2=(-6-y1)/(-3-0)
\n" ); document.write( "8=8-y1 ; 2=(-6-y1)/-3
\n" ); document.write( "0=-y1 ; -6=-6-y1
\n" ); document.write( "0=y1 ; 0=-y1-->0=y1 -----> b is 0\r
\n" ); document.write( "\n" ); document.write( "y=2x
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