anonymous
  • 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
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • 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
  • triciaal
Y-intercept when x =0
triciaal
  • triciaal
The number of games won without practicing

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triciaal
  • triciaal
The line of best fit Find the slope
triciaal
  • triciaal
For any (x y) slope-intercept form Y = m x + b where m is the slope and b = y-intercept
triciaal
  • triciaal
Part. C. Find y when x = 13
anonymous
  • 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
  • anonymous
@triciaal I think the slope is 1? Because it's 4 over 4 which simplifies to 1. Would you agree or disagree?
anonymous
  • anonymous
Anyone still here?
triciaal
  • triciaal
Responding elsewhere
anonymous
  • anonymous
No worries. Take your time, I just wanted to make sure I wasn't alone haha
triciaal
  • triciaal
Let me get to the PC so I can use the draw. Easier for me than this Ipad
anonymous
  • anonymous
That's fine! Thank you
triciaal
  • triciaal
finally here
triciaal
  • triciaal
|dw:1434859950040:dw|
triciaal
  • triciaal
look at your graph find 2 point (x1, y1) and (x2, y2) plug into the formula and compute m
triciaal
  • triciaal
|dw:1434860135452:dw|
triciaal
  • 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
  • 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
  • triciaal
|dw:1434860827792:dw||dw:1434860984600:dw||dw:1434861025557:dw|
anonymous
  • 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
  • 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
  • triciaal
notice the points I used are the ones actually on the line--best fit
triciaal
  • 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
  • anonymous
Haha, I'm literally saving all of this. You've honestly helped so much
triciaal
  • triciaal
great. all the best with your studies.

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