document.write( "Question 122273: Points X (-1,1),Y (3,5), and Z (17,1), are the coordinates of three vertices of a parallelogram. What are the possible coordinates of W, the fourth vertex? \n" ); document.write( "
Algebra.Com's Answer #89826 by MathLover1(20850)\"\" \"About 
You can put this solution on YOUR website!
one more solution is here\r
\n" ); document.write( "\n" ); document.write( "since YW || XZ ...=> W have y coordinates same as Y; W(x,5)\r
\n" ); document.write( "\n" ); document.write( "since distance between points X an Z is \"1%2B17=18\" units, so and distance between points Y an W is \"d=3%2B18=21\" ...so \"x=21\"\r
\n" ); document.write( "\n" ); document.write( "then we have that the coordinates of W are(\"21\",\"5\")
\n" ); document.write( "
\n" ); document.write( "
\n" );