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Best Fit 1
Közreműködött: Tilashalski
REMEMBER!

Type data tables in
STAT EDIT.

Use 4:LinReg(ax+b)
for line of best fit

Use 5:QuadReg for
curve or quadratic of
best fit
Dr. M looked at gas prices for the last 5 years. 
Write an equation for the line of best fit. 

y = 0.55x + 3.15

y = 3.15x + 0.55

y = 2.295x + 0.127

y = 0.127x + 2.295

Dr. M looked at gas prices for the last 5 years. 

Based on the line of best fit you found, what will be

the price of gas in 10 years?

$2.75

$3.57

$3.95

$4.15

Determine the quadratic curve of best fit for the data. 

Hint: Type

x-values in

one column

& y-values

in the other.

Use 5:QuadReg

{(-3, 2), (0, 5), (1, 7.3), (-1, 3.3),

 (-6, 5), (-7, 7.3)}

y = .33x2 + 2x + 5

y = .33x- 2x - 5

y = .33x+ 2x - 5

y = .33x- 2x + 5

Use the curve of best fit you found to estimate the

value of y when x = -4.   

Hint: Plug

-4 into x

{(-3, 2), (0, 5), (1, 7.3), (-1, 3.3),

 (-6, 5), (-7, 7.3)}

8.91

2.28

3.45

6.78

Anna offered to buy lunch for everyone in GW. 

She investigated the cost of a catered lunch for

different numbers of people. 

What is the equation for the line of best fit?

y = 4.5x + 75

y = 5.15x + 125

y = 6.25x + 125

y = 7.85x + 250

Use the line of best fit you just found to estimate

how much Anna will pay for lunch for 50 people. 

Anna offered to buy lunch for everyone in GW. 

She investigated the cost of a catered lunch for

different numbers of people. 

$352

$438

$479

$512

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