document.write( "Question 302040: Here's another accuplacer practice question that I have no clue about: \"write the slope intercept form of the equation (-2,0)and (7,4). The answer that lights up correct is Y=4/9x + 8/9. Can someone tell me why this is correct, and in general , how to write slope intercept forms? Thanks lots. \n" ); document.write( "

Algebra.Com's Answer #216578 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
The formula to use when given 2 points is:
\n" ); document.write( "

\n" ); document.write( "where the given points are:
\n" ); document.write( "(x1,y1) and (x2,y2)
\n" ); document.write( "It doesn't matter which is which, but I can call
\n" ); document.write( "(x1,y1) = (-2,0)
\n" ); document.write( "and
\n" ); document.write( "(x2,y2) = (7,4)
\n" ); document.write( "Putting these into the formula:
\n" ); document.write( " $\"%28y+-+4%29%2F%28x+-+7%29+=+%280+-+4%29%2F%28-2+-+7%29\"$
\n" ); document.write( " $\"%28y+-+4%29%2F%28x+-7%29+=+4%2F9\"$
\n" ); document.write( "Multiply both sides by $\"x-7\"$
\n" ); document.write( " $\"y+-+4+=+%284%2F9%29%2A%28x+-+7%29\"$
\n" ); document.write( " $\"y+-+4+=+%281%2F9%29%2A%284x+-+28%29\"$
\n" ); document.write( " $\"9y+-+36+=+4x+-+28\"$
\n" ); document.write( " $\"9y+=+4x+%2B+8\"$
\n" ); document.write( " $\"y+=+%284%2F9%29%2Ax+%2B+8%2F9\"$ answer \n" ); document.write( "

\n" );