anonymous
  • anonymous
3. Solve the system by the substitution method. Show your work. 2y - x = 5 x2 + y2 - 25=0 ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
y(4y + y - 20) = 0 so, y = 0 or 4y+y-20 = 0 5y -20 = 0 y =45y-20=05(4)-20=00=0 x = 2y -5when y=4x = 8-5 =32y - x = 5x2 + y2- 25 = 02y - x = 5 2y - 5 = x so x = 2y - 5 (2y - 5)² + y² - 25 = 0 (2y - 5)(2y - 5) 4y² - 10y - 10y + 25 4y² - 20y + 25 4y² - 20y + 25 + y² - 25 = 0 4y² + y² - 20y = 0 4y² + y² - 20y = 0 y(4y + y - 20) = 0 y=0 x= -5 2y - x = 5 2(0) - x = 5, so x= -5) (-5,0) this wwas my answer
anonymous
  • anonymous
my teacher said 3. Solve for x using equation 1 and then substitute this in the second equation. Once you simplify you will have a quadratic equation which you can factor and solve. Remember to factor out the GCF first.. The solutions should be written as ordered pairs (x1,y1) and (x2,y2).
anonymous
  • anonymous
@Abhisar @Clalgee @dan815 @ganeshie8

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anonymous
  • anonymous
if my answer is correct what did she mean she only gave me two out of five points for thisw question
anonymous
  • anonymous
@ShadowLegendX
anonymous
  • anonymous
@nevermind_justschool
anonymous
  • anonymous
@peachpi
anonymous
  • anonymous
For one, you should have two solutions
anonymous
  • anonymous
or did I miss it?
anonymous
  • anonymous
somone sadi to use (3,4)
anonymous
  • anonymous
\(2y - x = 5\) → \(x=2y-5\) \(x^2 + y^2 - 25=0\) \((2y-5)^2+y^2-25=0\) \(4y^2-20y+25+y^2-25=0\) \(5y^2-20y=0\) \(5y(y-4)=0\) \(y=0,~y=4\) Back substitute to find x
anonymous
  • anonymous
ok I see. On this line you needed to solve for both y's y(4y + y - 20) = 0 You got \(y = 0\), but missed \(4y+y-20=0\)
anonymous
  • anonymous
wait there were two y's
anonymous
  • anonymous
yep. That's a quadratic equation so it has two solutions
anonymous
  • anonymous
ohh so i nned solve for the second one right
anonymous
  • anonymous
yes
anonymous
  • anonymous
can you help me withthat im so sleepy but i needa get this done
anonymous
  • anonymous
I already put it up there. It's 4
anonymous
  • anonymous
ohh ik that thnx hahaha see my sleepiness is messing with my brain thnx again padre
anonymous
  • anonymous
np
anonymous
  • anonymous
how do i copy and paste that i cant seem to get it highlighted to copy it and its killing me lol
anonymous
  • anonymous
help me one more time please @peachpi
anonymous
  • anonymous
idk that happens a lot with chrome. try double clicking the whole thing then deleting what you don't want
anonymous
  • anonymous
its mot working when i double click it it hightlights like 1 number
anonymous
  • anonymous
maybe try another browser
anonymous
  • anonymous
i got it highlighted but it wont let me coppy it
anonymous
  • anonymous
is there another way you could write it for me or nah
anonymous
  • anonymous
why can't you use what you had originally. It's right. Just add the line y = 4, x = 3 at the end
anonymous
  • anonymous
ohh ok i thought i needed the whole thing sorry
anonymous
  • anonymous
no, your stuff is good. you just missed one of the solutions, last step.
anonymous
  • anonymous
ok thnx bro gn

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