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Maths Help watch

1. http://postimg.org/image/6zm9cufjx/25a3974c/ All of the questions in the image are proving difficult. All help appreciated, thanks.
2. (Original post by TehBrewer)
http://postimg.org/image/6zm9cufjx/25a3974c/ All of the questions in the image are proving difficult. All help appreciated, thanks.
The first two:

12)a) You know the equation for a straight line is y = mx + c
Try to find the equation in this form before rearranging.
b) Area of a triangle = 1/2 base x height

13)a) Gradient of a line = (y2 - y1)/(x2 - x1)
Insert coordinates and solve for k
b) Find c in y = mx + c

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