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How to find the equations of lines on a graph.

It's on my finals review and it shows pictures of graphs the question is - Find the equations of the lines below.

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Vivian L. | Microsoft Word/Excel/Outlook, essay composition, math; I LOVE TO TEACHMicrosoft Word/Excel/Outlook, essay comp...
3.0 3.0 (1 lesson ratings) (1)
Hi Scooter;
I will gladly help you find the equations.
Please provide at least two points of each line and present these as (x,y).
It would be nice if one point of each line is the y-intercept, the point of y when x=0.
Ralph L. | Algebra I, II, Visual Basic, Beginning C++ tutorAlgebra I, II, Visual Basic, Beginning C...
4.0 4.0 (1 lesson ratings) (1)
What I would do is look at the graph and find the y intercept. Now, calculate the slope of the line by obtaining two points from the graph. Lastly, find the equation with the same y-intercept and slope.