## juanaandrea 2 years ago -y - 2 = x + 1 is a decreasing function

1. raffle_snaffle

make it a function of y respect to x

2. abb0t

Yes. If you put it in the form: \(\sf \color{red}{y=mx+b}\) You will see

3. juanaandrea

ok so it is increasing y=-2x+1

4. raffle_snaffle

what makes you say it's increasing?

5. juanaandrea

sorry decreasing

6. abb0t

Yes.

7. raffle_snaffle

okay right!

8. satellite73

god help us it is not your fault, but \[-y - 2 = x + 1\] is not a function at all it is an equation

9. abb0t

It's a linear function, no?

10. juanaandrea

I have it in my homework it says if it is increasing or decreasing

11. juanaandrea

yes

12. satellite73

no it is not a linear "function" it is an equation for a line thus beginning the long confusion between the concept of "function" and "equation" it is not your fault just bad math teachers

13. juanaandrea

aaaa

14. satellite73

anyway what they want you to do is solve for \(y\) \[-y - 2 = x + 1\] \[-y=x+3\] \[y=-x-3\]

15. juanaandrea

but is it increasing or decreasing

16. satellite73

and then say "since the slope is negative, it is decreasing

17. satellite73

\[y=-x-3\\y=mx+b\] \[m=-1\] so it is decreasing

18. juanaandrea

ok thank you. was not sure

19. satellite73

yw sorry you have such a crappy book

20. juanaandrea

y = -5x + 4 so this one is increasing right

21. juanaandrea

i meant decreasing sorry didnt see the -

22. satellite73

yeah, decreasing

23. juanaandrea

k thanks