anonymous
  • anonymous
solve for x and y |x y| minus |-y x| |-y x| |x y | equals |4 6| |-4 6| does anyone know how to do this?
Mathematics
schrodinger
  • schrodinger
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myininaya
  • myininaya
ok so you have x+y=4, y-x=6, -y-x=-4, x-y=6 correct?
anonymous
  • anonymous
right
anonymous
  • anonymous
Its a matrix problem

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myininaya
  • myininaya
x+y=4 => y=4-x, then (4-x)-x=6 4-2x=6 => -2x=6/4=3/2 => x=-3/4 so y=4-x=4-(-3/4)=4+3/4=16/4+3/4=19/4
anonymous
  • anonymous
im a little confused
myininaya
  • myininaya
what bothers you?
anonymous
  • anonymous
explain to me where the 2 came from? was it when you added the 2 ys and xs of the matrix?
myininaya
  • myininaya
ok i took the first equation and solved it for y and then I wrote the second equation in terms of x so i only had one unknown in this equation
anonymous
  • anonymous
ok
anonymous
  • anonymous
aw i see. thanks for your help!
myininaya
  • myininaya
one sec okay?
myininaya
  • myininaya
dont leave I have something for you
myininaya
  • myininaya
I made a mistake. Click on this attachment,
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anonymous
  • anonymous
ok
anonymous
  • anonymous
so x =-1. I didnt see what y equaled.
myininaya
  • myininaya
you don't see y=4-(-1)=4+1=5
anonymous
  • anonymous
ok i see it so y=5
myininaya
  • myininaya
lol i ran out of room to put it on one line
anonymous
  • anonymous
Thats ok i really appreciate your help. THANK YOU!
myininaya
  • myininaya
np

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