## LaynaMae 2 years ago Help please ?

1. LaynaMae

2. LaynaMae

@ganeshie8 I only have 4 more questions ! D:

3. ganeshie8

good :)

4. LaynaMae

Yay so you're willing to help ? :)

5. ganeshie8

yes why not for a brilliant student like u, its easy to explain :)

6. LaynaMae

Great ! Thank you so so much ! You have no idea how much I appreciate it :)

7. ganeshie8

ok, so Juliana has $24 in her pocket. and she wants to knw how many text messages she can send 8. LaynaMae Right 9. ganeshie8 she knows that $$f(x) = (3x+2)/4$$ gives the cost, when u put number of messages x into the equation 10. ganeshie8 for example, if u have texted 10 messages cost wud be :- f(10 ) = (3(10)+2)/4 = 32/4 = 8 so it wil cost u$8 just to text 10 msgs... pretty costly !!

11. LaynaMae

Okay makes sense !

12. ganeshie8

but thats not wat we want, here our task is to find a function, into which we can plugin the MONEY we have, and it should tell us how many TEXTS we can message

13. LaynaMae

I tried working it out and got 18.5 ..

14. ganeshie8

right ?

15. LaynaMae

I think I'm getting ahead of myself here haha i apologize

16. LaynaMae

And yes , right :)

17. ganeshie8

its okay, but 18.5 messages for $24 doesnt look correct 18. ganeshie8 let me show u how to do this step by step 19. LaynaMae Please and thank you ! 20. ganeshie8 given equaiton :- $$y = f(x) = (3x+2)/4$$ here, x is number of texts, y is dollars 21. ganeshie8 since you wanto know how many texts u can send, you need to solve x above. 22. ganeshie8 $$y = (3x+2)/4$$ solve x 23. LaynaMae How would I start off ? 24. ganeshie8 multiply 4 both sides 25. LaynaMae 4(3x+2) ? 26. ganeshie8 $$y = (3x+2)/4$$ multiply 4 both sides $$4y = 3x+2$$ 27. ganeshie8 next, subtract 2 both sides 28. ganeshie8 $$y=(3x+2)/4$$ multiply 4 both sides $$4y=3x+2$$ subtract 2 both sides $$4y-2 = 3x$$ divide 3 both sides $$\large \frac{4y-2}{3} = x$$ 29. ganeshie8 now, replace x and y (just do it, il tell you later why :)) 30. ganeshie8 replace x & y $$\large \frac{4x-2}{3} = y$$ $$\large y = \frac{4x-2}{3}$$ 31. LaynaMae Isn't it to put the equation in the correct form ? 32. ganeshie8 thats the required function, where u need to plugin x=$24, and it gives u number of text messages u can send !

33. ganeshie8

exactly ! you're right, we replace x and y, to put the function in right form :)

34. LaynaMae

Yay :D

35. ganeshie8

put x = 24, and see how many messages she can send

36. LaynaMae

Wait so that's the answer ?

37. ganeshie8

yes thats the required function ! since the question wants u to explain, explain wat we did so far :)

38. ganeshie8

btw, for $24, she can send :- $$\large y = \frac{4x-2}{3}$$ $$\large y = \frac{4(24)-2}{3}$$ $$=33$$ 39. ganeshie8 sorry, that should be 31, so she can send 31 messages 40. LaynaMae So with$24 she can send 33 text messages ?

41. ganeshie8

*31

42. LaynaMae

Oh okay :) So everything we just worked through is the answer basically ? Because it says to put in complete sentences

43. ganeshie8

yes ! ima hav dinner... brb :)

44. LaynaMae

Haha okay !

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