## starrhunter 2 years ago Jackson is on a new exercise regimen. To begin, his trainer does not want him to complete more than a total of 27 lunges and sit-ups. For every lunge that he completes, Jacob burns 30 calories. He burns an additional 20 calories for every sit-up. His goal is to burn at least 620 calories during a workout session. Which is a combination of lunges and sit-ups that Jacob can complete in a session? 7 lunges and 19 sit-ups 11 lunges and 15 sit-ups 10 lunges and 14 sit-ups 12 lunges and 19 sit-ups

1. starrhunter

Cool thanks, I will try and figure out some if I can with that equation. Thanks.

2. starrhunter

So just use the process of elimination? I tried doing that but none of my math turned out to be any answer choice given :/

3. aajugdar

haha

4. Emah

whats so funny dude?

5. aajugdar

hmm equations

6. aajugdar

let me explain

7. starrhunter

8. Emah

Go ahead you can probably help her way more that I can.

9. aajugdar

let lunges = x and sit ups = y so his trainer has said not to do total more than 27 so x+y =27 and he should burn atleast 620 calories so 30 calories for lunges and 20 for situps so you have 30x+20y =620 solve these 2 equations you will get answer

10. aajugdar

got it?

11. Emah

Goodness...I knew how to do that and totally forgot about the other equation :P Lol I always do stuff the hard way cause i forget the easier way.

12. starrhunter

i am not so good at substitution but I am leaning towards answer choice b. am i correct?

13. aajugdar

star hunterrr what will you do if there are no options given

14. Emah

lol ^

15. starrhunter

Well I work backwards a lot, so I guess I will fail. I know I need to practice more. but for now, I just wanna get this review done :) and make sure I am ready for my exam tomorrow.

16. aajugdar

well you cant solve the equations then are you?

17. aajugdar

okay do this x+y =27 x= 27-y put value of x in 2nd equation and find y

18. starrhunter

Well now i am doubting myself. I worked through the steps and 630 is what i got. So. am i right? about the answer being b?

19. aajugdar

11+25 = 26

20. aajugdar

not 27

21. aajugdar

well none of them totals 27 :|

22. starrhunter

yeah that's where i am getting stuck. I keep plugging in all the answer choices but none of them seem to make sense.

23. aajugdar

i guess it is right not more than 27 and atleast 620 so you can go for B

24. starrhunter

that was my rationale