## britbrat4290 2 years ago Solve the system by the substitution method. xy = 12 x2 + y2 = 40

1. live10000000

Why can't you do your own work

2. britbrat4290

y dont u pop off

3. live10000000

no thanks

4. britbrat4290

yea get off my question if u just wanna start trouble toodels

5. ilfy214

Thats hilarious sorry! :) But anyways you can use either equation: $xy = 12$$x= \frac{ 12 }{ y }$ OR $x^2 + y^2 = 40$$x + y = \sqrt{40}$$x = \sqrt{40} - y$ **The y and the x can be switched....

6. ilfy214

All you need to do is plug in.

7. britbrat4290

haha i know .. ok then y does it give me 4 quandrants to pick from ?

8. britbrat4290

example {( 2, 6), ( 6, 2), ( 2, -6), ( 6, -2)}

9. britbrat4290

@ilfy214

10. ilfy214

From what I solved I got these solutions. 6, 2, -2

11. britbrat4290

im just confused on plugging them in ..

12. ilfy214

Doesn't it depend on how you solved your equation? Also, when I plugged in -2 and 6 for the first problem, I got -12 instead of 12.

13. britbrat4290

im going w/ b

14. ilfy214

I was thinking for along the lines of C?

15. britbrat4290

i just dont understand how i allways mess that up

16. ilfy214

Because in B, if you try using ( 2, -6) and ( -2, 6) you already have a problem for the equation below:$xy = 12$$(2)(-6) = -12$$(-2)(6)= -12$

17. ilfy214

Its okay! Just choose the options that give you BOTH positive answers

18. britbrat4290

thank u i appreciate it !! :)

19. ilfy214

You're welcome! :D