Question 1131512

if parallelogram {{{ABCD}}} ​ is a rectangle, than {{{AC}}} and {{{BD}}} are diagonals which are same length

{{{AC=2y+7 }}}
{{{BD=3y-4}}}

=> {{{3y-4=2y+7 }}}

{{{3y-2y=4+7 }}}

{{{y=11 }}}