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.
B.
y
= 3
x
+ 2
C.
y
= -3
x
+ 15
D.
Hint
2.
Write an equation in slope-intercept form for the best-fit line of a scatter plot with points (12, 9) and (17, 2).
A.
B.
y
= 1.4
x
– 7.8
C.
D.
y
= -1.4
x
+ 25.8
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.
y
= -5
x
+ 162
B.
C.
D.
y
= 5
x
– 48
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 4.6 hours
B.
about 3.8 hours
C.
about 3.1 hours
D.
about 2.3 hours
Hint
5.
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.
$23.25
B.
$23.85
C.
$22.65
D.
$22.05
Hint