anonymous
  • anonymous
y = −x^2 + 4 y = 2x + 1 How would you solve by elimination or substitution?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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rvc
  • rvc
we have : \[\rm y=-x^2+4~ and ~y=2x+1\]
anonymous
  • anonymous
yes, I don't get how you would solve them though
rvc
  • rvc
so we have two values for y

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rvc
  • rvc
we can put any of those
anonymous
  • anonymous
like \[-x^2+4=2x+1\]
rvc
  • rvc
yes
rvc
  • rvc
now solve further :)
anonymous
  • anonymous
but how would you subract them. Thats what im stuck on.
rvc
  • rvc
here it is : \[\rm 2x+1+x^2-4\]
anonymous
  • anonymous
that is what y equals then right?
rvc
  • rvc
no since when we solve the equation we are left only with x. then we will put the value of x in any one of the original equation to find the value of y
anonymous
  • anonymous
Im really stuck then .. how would you find what x and y are?
rvc
  • rvc
here it is : \[\sf x^2+2x-3=0\]
rvc
  • rvc
we have to solve the quadratic equation
anonymous
  • anonymous
I get x = 1, -3
rvc
  • rvc
yep now put one value at a time in either : y = 2x+1 or y=-x^2+4
anonymous
  • anonymous
Thank you :)
rvc
  • rvc
Thank you All the best :)

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