cutiecomittee123
  • cutiecomittee123
x^2+4y=100 4y-x^2=-20 How in the world so I solve this system of equations please help fast! Do I use substitution? I don't clearly see how I would solve for x or y in either equation.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
you can use substitution because x^2 on the first equation is positive and negative on the second equation. They will cancel out
anonymous
  • anonymous
*as i was, the 4y's will cancel out
cutiecomittee123
  • cutiecomittee123
so add them together

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cutiecomittee123
  • cutiecomittee123
I get y=10
anonymous
  • anonymous
yup x^2-(-x^2)=2x^2 and then 100-(-20)=120 2x^2=120 120/2=60 x^2=60 and then take the square root
cutiecomittee123
  • cutiecomittee123
yeah so square root of 60 = x
anonymous
  • anonymous
exactly, and whatever x equals you plug it into to one of the equations to find y
cutiecomittee123
  • cutiecomittee123
I plugged it into the second equation and it worked. So does that mean there is only one solution?
anonymous
  • anonymous
no the number you plugged in is the answer for x. The answer you got after you plugged it in is y
anonymous
  • anonymous
remember, there is an x and a y so there has to be at least 2 answers, one for each letter
cutiecomittee123
  • cutiecomittee123
Yeah so (sqrt60, 10) is the only solution?
cutiecomittee123
  • cutiecomittee123
I got the answer wrong it was actually (6,4) :(((

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