Formula for point-slope:

Plug in the values (1):

{Choice B}
Plug in the values (2):

{Choice C}
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[For (3) and (4) we need to solve for slope]
(3)
First, solve for slope.
Formula for slope:

Plug in values:

Slope:

Second, we must plug into point-slope form.
Formula for point-slope:

Plug in the values:

{Choice C}
(4)
First, solve for slope.
Formula for slope:

Plug in values:

Slope:

Second, we must plug into point-slope form.
Formula for point-slope:

Plug in the values:

{Choice D}
if you don't have a Unit Circle, this is a good time to get one, you can find many online.
Check the picture below.
Answer: y = (1/2)x + 2
Explanation
Answer: the 3rd one
Step-by-step explanation:
Find the amount of the first one
P=168/0.04*3
P=1400
Use the in the second one to find the interest
I=1400*0.06*4
I=336
336 is double the amount of 168
So the answer is B