## ramirokool 2 years ago John wants to rent movies over his school vacation. The cost for the movie rental is $4.50 per movie. John starts out with$20. Write an equation for the amount of money, y, John will have after x amount of movie rentals. Answer y = 20 - 4.50x y = 4.50x - 20 y = 20 + 4.50x y = 4.50x

1. ramirokool

@MiaKitty @UnkleRhaukus Help

2. MiaKitty

This is just like the question I helped you with earlier, but you have to combine them together, what do you think?

3. ramirokool

Either B or C

4. UnkleRhaukus

$y=mx+b$ where $$m$$ is the rate of change and $$b$$ is the initial value

5. MiaKitty

Well, it isn't B, because you don't subtract values in this equation, so?

6. uber1337h4xx0r

I have a question for you, ramiro: Let's say you buy two movies. How much money will you be left with?

7. ramirokool

Ummm probably 0

8. ramirokool

or at least 3 bucks or something

9. uber1337h4xx0r

Hmm... tell me this: how much would two movies cost?

10. MiaKitty

I have to go now! Anyone who can help Ramirocool can. :)

11. ramirokool

@UnkleRhaukus I got A

12. UnkleRhaukus

note $$mx+b=b+mx$$

13. ramirokool

@UnkleRhaukus D.

14. uber1337h4xx0r

@UnkleRhaukus : I think at Ramiro's age, formulas like that are more confusing that actually using real life examples. Granted, I'm under the impression that Ramiro doesn't care either way, so it probably doesn't matter.

15. UnkleRhaukus

if one movie costs $4.50 two movies costs 2×$4.50=

16. ramirokool

8.50

17. ramirokool

@UnkleRhaukus

18. uber1337h4xx0r

Close. But do it on paper to be safe.

19. ramirokool

@uber1337h4xx0r /yup B

20. UnkleRhaukus

$2\times4.50=2\times4+2\times0.50=8+1=$

21. ramirokool

@UnkleRhaukus Sorry for the long wait C.

22. ramirokool

Right?