(I need help really badly -

Question

(I need help really badly >-<)

Assume a 150 pound person burns 120 calories after 2 hours of sleep and 240 calories after 4 hours of sleep.
Part 1 (2 points): Use calories as the y−coordinate and hours as the x-coordinate. After writing two ordered pairs, find the slope. What does the slope represent in terms of the information provided?
Part 2 (2 points): Write an equation, in slope intercept form, to represent this data.
Part 3 (2 points): How many calories will this person burn after 8 hours of sleep? Using complete sentences, explain how the equation, slope, or graph can help to pred

anonymous · Answer

the rest: predict calories burned.

I need help for part 2 and 3...

anonymous · Answer

So you've found the slope. What did you get?

anonymous · Answer

60

anonymous · Answer

Cool, now write the equation in the form $y = mx +c$
where m is the slope (which you just told me and c is the y intersect)

anonymous · Answer

I kind of need help on finding the y-intercept, what I have now is y = 60x

anonymous · Answer

We are looking for the y intercept i.e. when x = 0. We know that x is the hours and y represents calories lost. How many calories would one lose after sleeping for 0 hours?

anonymous · Answer

so 0 calories would be the y-intercept? y=60x?

anonymous · Answer

Yep!

anonymous · Answer

Okay, that was easy xD How about part 3? I'm not really good at those...

anonymous · Answer

We can just plug in the various numbers in to the equation $y = 60x$. We are looking for number of calories after 8 hours. So what are the values for x and y?

anonymous · Answer

Ah, I need to explain... I just noticed. I know x is 8 for sure, but y I need help on

anonymous · Answer

We only know x.    $y = 60x$    Now substitute x for 8 giving.
$y = 60 \times 8$
Does that make sense?

anonymous · Answer

Oh, now it does! So the person burned 480 calories?

anonymous · Answer

BOOM!!! Got it right!

That answer makes sense too, because if I burn 240 calories every 4 hours (which was given in the question) it makes sense to double it right?

Anyway glad I could help! Let me know if you have any other questions about this.

anonymous · Answer

Okay! Thanks so, so, so, so much!