Question

helpp almost done!!
http://img594.imageshack.us/img594/9951/121026165353.png

Answer 1

\[y=mx+c\]They want you to find the y-intercept, c.
So you need to calculate the gradient, m.\[m={\Delta y \over \Delta x}={{y_1 - y} \over {x_1 - x}}\]You have two points, plug them in and find the gradient.
Then substitute the gradient and one of the points into the line equation, and solve for c.

Answer 2

hmm

Answer 3

Do it step by step. Find the gradient. What do you get?