1.
Write an equation in slope-intercept form for the best-fit line of a scatter plot which contains the points (4, 60) and (9, 135).
A.
y
= 15
x
B.
C.
y
= -15
x
D.
Hint
2.
Write an equation in slope-intercept form for the best-fit line of a scatter plot with points (21, 57) and (30, 12).
A.
y
= 5
x
– 48
B.
C.
y
= -5
x
+ 162
D.
Hint
3.
A best-fit line has the equation
which models the number of hours
y
of a trip that is
x
miles long. Predict the time of a 200-mile trip.
A.
about 3.8 hours
B.
about 4.6 hours
C.
about 2.3 hours
D.
about 3.1 hours
Hint
4.
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.
$22.65
B.
$22.05
C.
$23.85
D.
$23.25
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 $117.78
B.
about $114.27
C.
about $108.28
D.
about $117.28
Hint