## smartgirl101 3 years ago Solve the system of equations and give your answer as an ordered pair: 3y + 2x = 17 -x - 4y = -21

1. precal

what method would you like to use?

2. smartgirl101

it's either substitution or elimination

3. precal

which do you like?

4. smartgirl101

elimination

5. precal

ok do you want to cancel out the x's or the y's? Tell me what number you are going to multiply to which equation?

6. smartgirl101

the x's second equation

7. precal

ok you might want to rewrite the equations so that the x and y are underneath each other

8. precal

|dw:1333569378906:dw|

9. precal

what number do you multiply to equation 2 to make the x's cancel out

10. smartgirl101

1

11. precal

no

12. smartgirl101

3

13. precal

no

14. smartgirl101

6

15. precal

|dw:1333569507506:dw|

16. smartgirl101

2

17. precal

yes

18. smartgirl101

i thought about putting that

19. precal

|dw:1333569548378:dw|

20. precal

ok distribute the 2 to everything in the ( ), what do you get? You can reply using my drawing, click on the pencil on the upper right hand side

21. smartgirl101

|dw:1333569528644:dw|

22. precal

yes

23. precal

|dw:1333569714680:dw|

24. precal

add both equations together and what do you get?

25. precal

I can help you for about 10 more minutes then I have to go

26. smartgirl101

|dw:1333569715202:dw|

27. precal

|dw:1333569888166:dw|

28. precal

|dw:1333569913840:dw|

29. smartgirl101

|dw:1333569795605:dw|

30. precal

recall 2x and -2x make the x's go away

31. precal

I did not understand what you wrote , -5y=-25 so what is y?

32. smartgirl101

5

33. precal

yes y=5

34. precal

|dw:1333570054041:dw|

35. precal

can you solve for x now?

36. precal

I will be leaving soon, I have a couple of more minutes left

37. precal

|dw:1333570362931:dw|

38. precal

x=-1 y=5 solution is (-1, 5)