document.write( "Question 269255: through (8,-1) and (4,3) finding the slope intercept... \n" ); document.write( "

Algebra.Com's Answer #197360 by JBarnum(2146) $\"\"$ $\"About$

You can put this solution on YOUR website!
y=mx+b where m=slope and b= intercept
\n" ); document.write( "to find slope(m) of two points use the slope formula $\"m=%28y2-y1%29%2F%28x2-x1%29\"$
\n" ); document.write( "so for (8,-1)(4,3) x=(8,4)and y=(-1,3)
\n" ); document.write( " $\"m=%28%283%29-%28-1%29%29%2F%28%284%29-%288%29%29\"$ plug in the corresponding numbers
\n" ); document.write( " $\"m=%284%29%2F%28-4%29\"$
\n" ); document.write( " $\"m=-1\"$
\n" ); document.write( "now we know the slope and what the x's and y's are so find b
\n" ); document.write( " $\"y=mx%2Bb\"$
\n" ); document.write( " $\"-1=-1%288%29%2Bb\"$
\n" ); document.write( " $\"-1=-8%2Bb\"$ add 8 to both sides
\n" ); document.write( " $\"7=b\"$ this is intercept
\n" ); document.write( "to check put in the other point with slope
\n" ); document.write( " $\"y=mx%2Bb\"$
\n" ); document.write( " $\"3=-1%284%29%2Bb\"$
\n" ); document.write( " $\"3=-4%2Bb\"$ add 4 to both sides
\n" ); document.write( " $\"7=b\"$
\n" ); document.write( "this is correct because its the same number \n" ); document.write( "

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