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.
B.
C.
y
= 15
x
D.
y
= -15
x
Hint
2.
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.
B.
y
= 3
x
+ 2
C.
y
= -3
x
+ 15
D.
Hint
3.
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
+ 162
C.
D.
y
= 5
x
– 48
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.
$22.05
B.
$23.25
C.
$23.85
D.
$22.65
Hint
5.
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