document.write( "Question 1025727: Find a formula for the linear function whose graph intercepts the x-axis at x=80 and the y-axis at y= -90 \n" ); document.write( "

Algebra.Com's Answer #641028 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Define the points of intersection:
\n" ); document.write( "x-intercept: ( 80,0 )
\n" ); document.write( "y-intercept: ( 0, -90 )
\n" ); document.write( "--------------------
\n" ); document.write( "Use the general point-slope formula
\n" ); document.write( " $\"+%28+y+-+%28-90%29+%29+%2F+%28+x+-+0+%29+=+%28+0+-%28-90%29+%29+%2F+%28+80+-+0+%29+\"$
\n" ); document.write( " $\"+%28+y+%2B+90+%29+%2F+x+=+90+%2F+80+\"$
\n" ); document.write( " $\"+%28+y+%2B+90+%29+%2F+x+=+9%2F8+\"$
\n" ); document.write( "multiply both sides by $\"+8x+\"$
\n" ); document.write( " $\"+8%2A%28+y+%2B+90+%29+=+9x+\"$
\n" ); document.write( " $\"+8y+%2B+720+=+9x+\"$
\n" ); document.write( " $\"+8y+=+9x+-+720+\"$
\n" ); document.write( " $\"+y+=+%289%2F8%29%2Ax+-+90+\"$
\n" ); document.write( "--------------------
\n" ); document.write( "check answer:
\n" ); document.write( "does it go through ( 80,0 ) ?
\n" ); document.write( " $\"+y+=+%289%2F8%29%2Ax+-+90+\"$
\n" ); document.write( " $\"+0+=+%289%2F8%29%2A80+-+90+\"$
\n" ); document.write( " $\"+0+=+90+-+90+\"$
\n" ); document.write( " $\"+0+=+0+\"$
\n" ); document.write( "OK
\n" ); document.write( "does it go through ( 0, -90 ) ?
\n" ); document.write( " $\"+y+=+%289%2F8%29%2Ax+-+90+\"$
\n" ); document.write( " $\"+-90+=+%289%2F8%29%2A0+-+90+\"$
\n" ); document.write( " $\"+-90+=+-90+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );