## anonymous one year ago Help me! I will medal and fan, only one question!

1. anonymous

Evaluate the following expression using the values given: Find 5x − 3y − z if x = −2, y = 2, and z = −3 −19 19 13 −13

2. anonymous

I know that first, I would fill in the blanks.

3. anonymous

5x-2-3x2- (-3)

4. MichaelAlex292

Do you need me to explain it, or to just give you an answer?

5. anonymous

I do not want an answer, I just want someone to kind-of watch my work, so that I know I am solving it the right way. Asking for the answer would be against openstudy policies...

6. MichaelAlex292

Like integer rules?

7. anonymous

first, I would solve the multiplication, so 5x-2=-10, and 3x2=6, so -10-6-(-3), right?

8. MichaelAlex292

Yes that's correct!

9. anonymous

okay.. next, it would become -16- (-3), right, since we subtract 6 from -10?

10. MichaelAlex292

Yep :)

11. anonymous

then it would become -19??

12. anonymous

@MichaelAlex292

13. MichaelAlex292

Not quite... use your integer rules

14. anonymous

-13?

15. MichaelAlex292

Yes, now do you why?

16. anonymous

not really, both are negative, and we are not multiplying?

17. MichaelAlex292

Take this as an example:

18. MichaelAlex292

6 - (-3) When there are 2 minus signs, you add 6 + 3

19. MichaelAlex292

Now look at the one we were working on above

20. MichaelAlex292

-16 - (-3) = -16 + 3 = -13

21. anonymous

oh they cancel eachother out?

22. MichaelAlex292

See it now?

23. MichaelAlex292

Yea, the 2 minus signs form a plus

24. anonymous

yes

25. MichaelAlex292

Great!

26. anonymous

can u help with one more? Again, I dont want an answer, I want help

27. MichaelAlex292

Ok

28. anonymous

Evaluate the following: −3 − (−2). −5 −1<< I followed same rule as last time... 1 −6

29. MichaelAlex292

Wow, great job:\[-3 - (-2) = -3 + 2 = -1\] You are correct!

30. anonymous

ok, thanks!

31. MichaelAlex292

No problem