exam Maths Puzzle Numerical Ability

Which of the following is an equation of the line perpendicular to 3x+6y=12 and passing through (4,0)?

Answer Choices:

A) y=-1/2x+2
B) y=1/2x-2
C) y=-2x+8
D) y=2x-8

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exam Other Question

A colony of bacteria has 6.5 X 10^6 members at 8 A.M. and 9.75 X 10^6 members at 10:30 A.M. Find its population at noon.

I used the formula N = No X 2 ^ t/d

9.75 X 10^6 = 6.5 X 10^6 X (2)^ 2.5/d

how do i work from here? Find the slope of the line passing through the points (8, -3) and (1, 4).