FGHK is a rectangle with a width of 9 and a length of 12. One diagonal is 3x + 7y and the other diagonal is 6x + 9y. Find the values of x and y.
my formula was trying to plug in the numbers to equal first 9 then 12 but apparently its non of my options so can someone tel me how to figure this out

Question

FGHK is a rectangle with a width of 9 and a length of 12. One diagonal is 3x + 7y and the other diagonal is 6x + 9y. Find the values of x and y.
my formula was trying to plug in the numbers to equal first 9 then 12 but apparently its non of my options so can someone tel me how to figure this out

anonymous · Answer

Hint: Both diagonals of a rectangle are the same length.

anonymous · Answer

oqei let me figure it out

anonymous · Answer

hm im thinking 21 yes no?

anonymous · Answer

|dw:1335851069777:dw|
diagonals of a rectangle are equal so
3x + 7y = 6x + 9y