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Mathematics 9 Online
OpenStudy (anonymous):

@saifoo.khan Hi can i please get some help...?

OpenStudy (anonymous):

3. Having survived the meteor impact, thanks to some last-minute evasive maneuvers, the Mathonauts now set their sights on their Interstellar Headquarters. The Interstellar Headquarters orbits the Earth based on the equation y2 + x2 = 40,000. Using the original trajectory of the ship and complete sentences, explain to the pilot how to find where the ship’s path will cross the Interstellar Headquarters’s path.

OpenStudy (anonymous):

Original trajectory is y=2x+1

OpenStudy (anonymous):

I have to use Elimination or Substitution

OpenStudy (saifoo.khan):

Solve simultaneously?

OpenStudy (saifoo.khan):

Use substitution.

OpenStudy (anonymous):

could you please show me how...

OpenStudy (anonymous):

so if we have y2+x2=40,000 and y=2x+1 so do i do (2x)2+1

OpenStudy (saifoo.khan):

y2 + x2 = 40,000 and y = 2x+1. So insert the y of second equation into one. (2x+1)^2 + x^2 = 40000 Like this.

OpenStudy (anonymous):

i'm solving it

OpenStudy (anonymous):

i got 7.6

OpenStudy (anonymous):

4x2+2+x2=40,000 5x2+2=40,00 subtract 2 5x2=38 divide 5x2 x=7.6 Is it right..

OpenStudy (anonymous):

@saifoo.khan are you there? did i do it right..

OpenStudy (saifoo.khan):

(2x+1)^2 + x^2 = 40000 (4x^2 + 4x + 1) + x^2 = 40000

OpenStudy (anonymous):

i don't understand what you did.

OpenStudy (saifoo.khan):

FOIL?

OpenStudy (anonymous):

so now solve it..

OpenStudy (anonymous):

you want me to do it just like in the video

OpenStudy (saifoo.khan):

Yes.

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