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- anonymous

I think I have the answer but I'm not sure. Please help! I'll give a medal or whatever else.
Part A: What is the approximate y-intercept of the line of best fit and what does it represent? (5 points)
Part B: Write the equation for the line of best fit in slope-intercept form and use it to predict the number of games that could be won after 13 months of practice. (5 points)
picture here: http://prntscr.com/7jf9c6

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- anonymous

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- anonymous

For part A I have the y-intercept as 1 and it represents the number of games won. I just need help with part B :)

- triciaal

Y-intercept when x =0

- triciaal

The number of games won without practicing

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- triciaal

The line of best fit
Find the slope

- triciaal

For any (x y) slope-intercept form
Y = m x + b where m is the slope and b = y-intercept

- triciaal

Part. C. Find y when x = 13

- anonymous

I'm having a hard time finding the slope because of where the points lie. The rise/run method isn't really working for me here. Can you help explain it? I can't figure it out

- anonymous

@triciaal I think the slope is 1? Because it's 4 over 4 which simplifies to 1. Would you agree or disagree?

- anonymous

Anyone still here?

- triciaal

Responding elsewhere

- anonymous

No worries. Take your time, I just wanted to make sure I wasn't alone haha

- triciaal

Let me get to the PC so I can use the draw. Easier for me than this Ipad

- anonymous

That's fine! Thank you

- triciaal

finally here

- triciaal

|dw:1434859950040:dw|

- triciaal

look at your graph
find 2 point (x1, y1) and (x2, y2)
plug into the formula and compute m

- triciaal

|dw:1434860135452:dw|

- triciaal

take a sec to look at this it has a lot but follow the colors. let me know if you still have
any questions about the slope before we continue

- anonymous

Okay cool, I figured out how to write it in slope format. basically it's y = m(slope)x + b (y-intercept) ? Was my original y-intercept right ? And this case it'd just be y = x + y-intercept because it's 0, am I right?

- triciaal

|dw:1434860827792:dw||dw:1434860984600:dw||dw:1434861025557:dw|

- anonymous

Ohhh!!! I had it literally backwards. Do you mind if I save these pictures so I can use them in the future if I need help with problems like this?

- triciaal

not very neat but yes you can keep!
notice my first response
the independent variable is the time spent practicing, the controlled variable, the input, x
the number of games won changes. it depends on the amount of practice

- triciaal

notice the points I used are the ones actually on the line--best fit

- triciaal

for these remember the variable you control is your x and what is dependent is your y
b is the y-value when x = 0.

- anonymous

Haha, I'm literally saving all of this. You've honestly helped so much

- triciaal

great. all the best with your studies.

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