## raebaby420 2 years ago PLEASE HELP :3 Solve 2x + 5y = −13 3x − 4y = −8 (4, 1) (−4, 1) (4, −1) (−4, −1)

1. raebaby420

@Jack1 for ones like these: there is no parenthesis, or exponents, so I staret with the multiplication.. I want to get my y's to one side.. how do I do that? I divide them?

2. Jack1

i like to subtract first to isolate the one term on one side so 2x + 5y = −13 2x = -13 -5y x = -(13/2) - (5/2)y

3. Jack1

or if not, get them both in terms of 6x

4. Jack1

2x + 5y = -13 so 6x + 15y = -39 and 3x - 4y = -8 so 6x - 8y = -16 therefore 6x = -39 - 15y and 6x = -16 + 8y

5. raebaby420

AH I thought so, u do them apart and I knew I took the 5 from that side

6. Nurali

2x + 5y = −13-------(1) 3x − 4y = −8 --------(2) in equation 1 2x=-13-5y x=-13-5y/2 put x in equation 2 3(-13-5y/2)-4y=-8 -39-15y/2-4y=-8 -39-15y-8y=-16 -23y=-16+39 -23y=23 y=-1 put y in equation 1 2x + 5y = −13 2x+5(-1)=-13 2x-5=-13 2x=-13+5 2x=-8 x=-4

7. Jack1

6x = -39 - 15y = -16 + 8y -39 - 15y = -16 + 8y -39 = -16 + 23y -23 = 23y -1 = y

8. raebaby420

I see.

9. raebaby420

The next one I have I have to get the value of y.. is it the same way we get the value of x?

10. Jack1

exactly the same way, it doesn't matter if the term is called x or y or q, its all the same when using simultaneous equations

11. raebaby420

Ok I think I gotcha

12. raebaby420

What is the value of y in the solution to the following system of equations? 5x − 3y = −11 2x − 6y = −14 −1 0 1 2

13. raebaby420

This is what I have. ill let u no what I get

14. Jack1

cools

15. raebaby420

ok so I got

16. raebaby420

5x-3y=-11 +3y ____________ 5x=-11+3y

17. raebaby420

correct?

18. uri

where is +3y coming from?

19. Jack1

yep

20. Jack1

ignore uri, he's a little slow and apparently i hate him ;D

21. raebaby420

Oh..

22. uri

Huh? I'm a girl..and that's not the way to talk.

23. raebaby420

Where do I go from 5x=-11+3y

24. Jack1

sure u are... online anyway an i bet u tell that to all the boys ;P

25. uri

Ah? last time i checked..i was a girl.

26. Jack1

double it change it to 10x

27. raebaby420

..... sooo no one is going to help me but we will argue on my question?... Thanks guys

28. raebaby420

Now your confusing me and not helping me

29. Jack1

5x=-11+3y 10x = -22 + 6

30. uri

You are not even teaching her the right thing.Also,You are very mean and you don't know how to respond to someone..when they ask you a question. I might link you this: http://openstudy.com/code-of-conduct Next time if you're mean to me.I'll report you to Preetha. @Jack1

31. Jack1

so thats equation 1 in a form we can use now for equation 2: 2x − 6y = −14 change it so u get 10x on one side

32. Jack1

sorry, back to equation 1: it should be 10x = -22 + 6y, not 10x = -22 + 6, my bad now equation 2: 2x − 6y = −14 (times 5) 10x - 30y = -70 (add 30y to both sides) 10x - 30y + 30y = -70 + 30y 10x = -70 + 30y

33. Jack1

so equation 1 is now 10x = -22 + 6y and equation 2 is now 10x = -70 + 30y so 10x = -22 + 6y = -70 + 30y -22 + 6y = -70 + 30y can u solve from here?

34. thomaster

35. Jack1

@raebaby420

36. uri

Huehue.

37. Jack1

god u are such a girl XP

38. uri

You called me a boy dat mad me cry..:3

39. uri

40. Jack1

im sorry i called u a boy, i was jus playing and i took it too far, my bad

41. uri

It's alright.