1.
A scatter plot contains the points (2, 8) and (19, 59). Write an equation in slope-intercept form for the best-fit line of the scatter plot.
A.
y
= 3
x
+ 2
B.
y
= -3
x
+ 15
C.
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.
B.
y
= 5
x
– 48
C.
D.
y
= -5
x
+ 162
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 3.1 hours
B.
about 2.3 hours
C.
about 3.8 hours
D.
about 4.6 hours
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 $114.06
B.
about $114.15
C.
about $100.30
D.
about $110.16
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 $117.28
C.
about $114.27
D.
about $108.28
Hint