anonymous
  • anonymous
ABCD is a parallelogram. If AB = 2x - y, CD = 7, BC = x + y , AD = 2 find x and y.
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
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Loser66
  • Loser66
it is a parallelogram, hence AB = CD and BC = AD plug the given information in, what do you get for AB = CD?
anonymous
  • anonymous
2x - y =7

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anonymous
  • anonymous
and BC = AD is x + y =2
anonymous
  • anonymous
did u get ur answer?
Loser66
  • Loser66
how about AB = CD?
anonymous
  • anonymous
I don't know how to get the answer, like do I make both equations equal to each other or solve one at a time?
Loser66
  • Loser66
I am guiding you, just answer my questions, AB = CD gives you what??
anonymous
  • anonymous
2x - y = 7
Loser66
  • Loser66
Ok now you have 2 equations x+y = 2 2x-y = 7 -------------- add them together, what do you get?
anonymous
  • anonymous
3x = 9
Loser66
  • Loser66
|dw:1439252881954:dw|
Loser66
  • Loser66
ok, divide both sides by 3, what do you get?
anonymous
  • anonymous
x = 3 |dw:1439252921534:dw|
Loser66
  • Loser66
hold on, something is wrong.
Loser66
  • Loser66
Please, check your problem, it is NOT right for sure
Loser66
  • Loser66
Can you please, take a snapshot or scan the original one??
anonymous
  • anonymous
Loser66
  • Loser66
oh, nothing is wrong. hehehe. I am sorry. Ok, x =3 replace to x+y =2, y =??
anonymous
  • anonymous
y = -1?
Loser66
  • Loser66
Bingo, you got it.
anonymous
  • anonymous
Thank yoU! :)

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