1.
Write an equation in slope-intercept form for the best-fit line of a scatter plot with points (21, 57) and (30, 12).
A.
B.
C.
y
= -5
x
+ 162
D.
y
= 5
x
– 48
Hint
2.
A best-fit line has an equation of
y
= 2.9
x
+ 1.7. Find
y
when
x
is 33.
A.
y
= 94
B.
y
= 94.1
C.
y
= 90.7
D.
y
= 97.4
Hint
3.
A best-fit line has the equation
y
= 1.75
x
+ 2.25, which models the cost y of renting a taxi for
x
miles. Predict the cost of renting a taxi for a 12-mile ride.
A.
$23.85
B.
$22.05
C.
$22.65
D.
$23.25
Hint
4.
A best-fit line has the equation
y
= 13.7694
x
+ 3.99, which models the cost
y
of ordering
x
CDs from a music company. Predict the cost of ordering 8 CDs.
A.
about $100.30
B.
about $110.16
C.
about $114.06
D.
about $114.15
Hint
5.
A best-fit line has the equation
y
= 37.4296
x
+ 4.99, which models the cost
y
of ordering
x
video games from an online store. Predict the cost of ordering 3 video games.
A.
about $114.27
B.
about $117.78
C.
about $117.28
D.
about $108.28
Hint