anonymous
  • anonymous
help me please
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Solve the system by the addition method. x2 - 3y2 = 1 3x2 + 3y2 = 15 A. {( 1, 2), ( -1, 2), ( 1, -2), ( -1, -2)} B. {( 1, 2), ( -1, -2)} C. {( 2, 1), ( -2, 1), ( 2, -1), ( -2, -1)} D. {( 2, 1), ( -2, -1)}
anonymous
  • anonymous
@isaac4321
anonymous
  • anonymous
._.

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JoannaBlackwelder
  • JoannaBlackwelder
Any thoughts on how to start?
anonymous
  • anonymous
substitute the x and the y maybe
JoannaBlackwelder
  • JoannaBlackwelder
Can you show me what you mean?
anonymous
  • anonymous
1+2 - 3+2 -1= 1
JoannaBlackwelder
  • JoannaBlackwelder
Hm, how did you get that?
anonymous
  • anonymous
x2 - 3y2 = 1 substituted in this equation
JoannaBlackwelder
  • JoannaBlackwelder
Hm, I'm not sure what you mean, but the question states to solve by the addition method. Not substitution.
JoannaBlackwelder
  • JoannaBlackwelder
The addition method works by adding the equations together in a way that cancels out one of the variables.
anonymous
  • anonymous
ok so how do i do that
JoannaBlackwelder
  • JoannaBlackwelder
|dw:1439917233250:dw|
JoannaBlackwelder
  • JoannaBlackwelder
See how I canceled out the y's?
anonymous
  • anonymous
yes
JoannaBlackwelder
  • JoannaBlackwelder
Sweet. Can you solve the equation for x?
anonymous
  • anonymous
x=2
anonymous
  • anonymous
or x=-2
JoannaBlackwelder
  • JoannaBlackwelder
Exactly! Both are possible solutions for x! :-) Any ideas what to do from here?
anonymous
  • anonymous
solve for y next maybe
JoannaBlackwelder
  • JoannaBlackwelder
Yep, great! Any thoughts on how to do that?
anonymous
  • anonymous
y=1 or y=-1
JoannaBlackwelder
  • JoannaBlackwelder
Good, but which x goes with which y?
anonymous
  • anonymous
i got that buy soing what you did in your drawing but i cancled out x then i solved what i got from that to get my answer
JoannaBlackwelder
  • JoannaBlackwelder
Ok, that's cool. But if you plug them back in, which ones make true statements out of the equations?
anonymous
  • anonymous
(y=1 x=2) (y=-1 x=-2)
JoannaBlackwelder
  • JoannaBlackwelder
Are those the only options?
anonymous
  • anonymous
idk are they
JoannaBlackwelder
  • JoannaBlackwelder
Try other options and see if they work too.
anonymous
  • anonymous
i cant get any of them to work
anonymous
  • anonymous
so is my anser d right
JoannaBlackwelder
  • JoannaBlackwelder
|dw:1439918238021:dw| What about this one?
JoannaBlackwelder
  • JoannaBlackwelder
|dw:1439918310526:dw|
anonymous
  • anonymous
so is the answer a
JoannaBlackwelder
  • JoannaBlackwelder
No, that one has the x and y values flipped.
anonymous
  • anonymous
ok imma stop guessing its c
JoannaBlackwelder
  • JoannaBlackwelder
Sounds good
anonymous
  • anonymous
thnx
JoannaBlackwelder
  • JoannaBlackwelder
yw

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