Question

1.

The y-intercept, to the nearest hundredth, of the line -10y = 10x + 21 is

2.

The y-intercept, to the nearest hundredth, of the line 7x + (5)y = -7 is

3.

The slope, to the nearest hundredth, of the line 11x + (2)y = 2 is

4.

A linear model is found to be y = 3.5x + 6. Determine the fit at x = 4.

a. 3.5

b. 6

c. 20

d. 22.3

e. 2.3

5.

The following data relates the time a student spends on an online test with the final score: (8 points, 12 minutes), (22 points, 34 minutes), (33 points, 72 minutes), (40 points, 120 minutes). Use your TI83 to determine the linear regression equation, and choose the best response below

a. Points = 9(Minutes) - 0.28

b. Points = 24(minutes) + 3.2

c. Points = 0.28(minutes) + 9

d. Points = -3.2(minutes) + 24

Answer 1

1) dividing each value with (-10) in equation: y=-x-2.1

therefore y-intercept = -2.1

2)

from above : y=-(7/5)*x-(7/5)

therefore y-intercept = -7/5 =-1.4

3)

from above : y=-(11/2)x+(2/2)

therefore slope =-(11/2) =-5.5

4)

fit =3.5*4+6=20

5)

from above

option C is correct: points=0.28*minutes+9