document.write( "Question 681575: m(3,-3) is the midpoint of RS. If S has coordinates (8,2) fine the coordinates of R \n" ); document.write( "
Algebra.Com's Answer #422707 by Jolliano(16)\"\" \"About 
You can put this solution on YOUR website!
Let the coordinates of R be (x1,y1).
\n" ); document.write( "Then, ([8 + x1]/2,[2 + y1]) = (3,-3)
\n" ); document.write( "Taking it one at a time,
\n" ); document.write( "(8 + x1)/2 = 3
\n" ); document.write( "Cross multiplying,
\n" ); document.write( "8 + x1= 3 * 2
\n" ); document.write( "x1 = 6 - 8
\n" ); document.write( "x1 = -2.
\n" ); document.write( "Also,
\n" ); document.write( "(2 + y1)/2 = -3
\n" ); document.write( "2 + y1 = 2 * -3
\n" ); document.write( "y1 = -6 - 2
\n" ); document.write( "y1 = -8.
\n" ); document.write( "Coordinates of R are (-2,-8).
\n" ); document.write( "
\n" );