muscrat123
  • muscrat123
The graph below shows the relationship between the number of months different students practiced tennis and the number of matches they won: 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 the slope-intercept form and use it to predict the number of matches that could be won after 13 months of practice. (5 points)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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muscrat123
  • muscrat123
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muscrat123
  • muscrat123
@Nnesha
muscrat123
  • muscrat123
@jim_thompson5910

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muscrat123
  • muscrat123
@ganeshie8 @Hero
muscrat123
  • muscrat123
@campbell_st
campbell_st
  • campbell_st
A where does the line cut the y-axis
muscrat123
  • muscrat123
?
campbell_st
  • campbell_st
y axis is the vertical axis
muscrat123
  • muscrat123
i know but what do u mean cut?
campbell_st
  • campbell_st
where it starts on the vertical axis
muscrat123
  • muscrat123
3?
campbell_st
  • campbell_st
seems to be a bit more that half way between 2 and 4
muscrat123
  • muscrat123
3.5?
campbell_st
  • campbell_st
ok... part B, find the slope of the line
muscrat123
  • muscrat123
so part a is 3.5? and i have trouble finding slope
campbell_st
  • campbell_st
well you have 1 point (0. 3.5) find another point on the line.
muscrat123
  • muscrat123
(1,3)
campbell_st
  • campbell_st
I don't think (1, 3) is on the line... on the x axis go up x = 5 till you hit the line what is the point..?
muscrat123
  • muscrat123
1,3 is the second point
muscrat123
  • muscrat123
and 5,12
muscrat123
  • muscrat123
@triciaal @campbell_st
muscrat123
  • muscrat123
@Nnesha
campbell_st
  • campbell_st
great so you have 2 points (0, 3.5) and (5, 12) so how far from 0 to 5 this is the run and how far from 3.5 to 12 this is the rise
muscrat123
  • muscrat123
?
campbell_st
  • campbell_st
if you start at 0 and go to 5, have far did you go..? and if you start at 3.5 and go to 12 how far did you go..?|dw:1438916881622:dw|
muscrat123
  • muscrat123
8.5 and 5
campbell_st
  • campbell_st
great |dw:1438917057707:dw| slope is m = 8.5/5 the the equation of your line is y = mx + 3.5 just calculate m and substitute it into the equation
muscrat123
  • muscrat123
what is m?
muscrat123
  • muscrat123
@teddydaddy23
campbell_st
  • campbell_st
m is called the slope of the line... and its defined by m = rise/run you have a rise of 8.5 and a run of 5
muscrat123
  • muscrat123
so what do i do?
muscrat123
  • muscrat123
plz its 11:15 and i gotta get up at 6 and i have 8 more lessons to do right now tonight
muscrat123
  • muscrat123
@dreamio
muscrat123
  • muscrat123
@campbell_st
muscrat123
  • muscrat123
@i_am_a_dude
campbell_st
  • campbell_st
so 8.5/5 = 1.7 so m = 1.7 the equation is y = 1.7x + 3.5 so substitute x = 13 and then calculate a y-value
muscrat123
  • muscrat123
so the y-intercept is 1.7 @triciaal
muscrat123
  • muscrat123
@i_am_a_dude
triciaal
  • triciaal
the y intercept is when x = 0 when x = 0 it is more than 2 glancing at the graph
muscrat123
  • muscrat123
so what is the y intercept?
triciaal
  • triciaal
it represents the number of wins without practice
triciaal
  • triciaal
(5,12) and (1, 5) 7/4 12 = 7/4(5) + b (48-35)/5 = 2.6
triciaal
  • triciaal
guess needs to be rounded can only use whole numbers so y-intercept 3
triciaal
  • triciaal
y = m x + b y = (7/4) * 13 + 3 26

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