document.write( "Question 158639: How do you find the slope and y intersept on a graph? (this is 8th grade math) \n" ); document.write( "

Algebra.Com's Answer #116855 by checkley77(12844) $\"\"$ $\"About$

You can put this solution on YOUR website!
SORRY THAT I AM NOT USING THE SAME APPROACH BUT THIS IS HOW I WAS TAUGHT & HOW IT IS TAUGHT IN OUR LOCAL SCHOOLS WHERE I HAVE TAUGHT.
\n" ); document.write( "-----------------------------------------------------------
\n" ); document.write( "GIVEN TWO POINTS (1,4) & (-2,6)
\n" ); document.write( "SLOPE=(Y2-Y1)/(X2-X1)
\n" ); document.write( "SLOPE=(6-4)/(-2-1)
\n" ); document.write( "SLOPE=2/-3=-2/3
\n" ); document.write( "NOW REPLACE THE X & Y TERMS IN THE LINE EQUATION [Y=mX+b] WITH ONE SET OF (X,Y) VALUES. m=SLOPE & b=Y INTERCEPT.
\n" ); document.write( "NOW SOLVE FOR b.
\n" ); document.write( "4=(-2/3)1+b
\n" ); document.write( "4=-2/3+B
\n" ); document.write( "b=4+2/3
\n" ); document.write( "b=(12+2)/3=14/3 IS THE Y INTERCEPT.
\n" ); document.write( "Y=-2X/3+14/3
\n" ); document.write( " $\"+graph%28+300%2C+200%2C+-6%2C+8%2C+-10%2C+10%2C+-2x%2F3+%2B14%2F3%29+\"$ (graph 300x200 pixels, x from -6 to 8, y from -10 to 10, -2x/3 +14/3). \n" ); document.write( "

\n" );