1.
Write an equation in slope-intercept form for the best-fit line of a scatter plot with points (7, 22) and (13, 25).
A.
y
= 2
x
+ 8
B.
y
= 0.5
x
+ 18.5
C.
y
= -0.5
x
+ 25.5
D.
y
= -2
x
+ 36
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.
y
= -5
x
+ 162
C.
D.
Hint
3.
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
4.
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 3.1 hours
C.
about 2.3 hours
D.
about 4.6 hours
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 $117.28
B.
about $114.27
C.
about $108.28
D.
about $117.78
Hint