Determine whether the given description corresponds to an observational study or an experiment. in a study of 387 girls with a particular disease, the subjects were injected with vitamins to determine if the vitamins have an effect on the disease. does the given description correspond to an observational study or an experiment?

the image of (6, 9) under a dilation is (4, 6). the scale factor is

answer: c

(2, -4)

goes 7 to the

(9, 4)

easy

none.

step-by-step explanation:

m

1

=

5

m1=5

b

=

−

1

b=-1

find the slope and y-intercept of the second equation.

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m

2

=

0

m2=0

b

=

−

6

b=-6

compare the slopes

m

m of the two equations.

m

1

=

5

,

m

2

=

0

m1=5,m2=0

compare the two slopes in the decimal form. if the slopes are equal, then the lines are parallel. if the slopes are not equal, then the lines are not parallel.

m

1

=

5

,

m

2

=

0

m1=5,m2=0