Links to help with writing an equation from a graph:
http://www.mathplanet.com/education/algebra-1/formulating-linear-equations/writing-linear-equations-using-the-slope-intercept-form
https://www.khanacademy.org/math/algebra-basics/core-algebra-graphing-lines-slope/core-algebra-equation-of-a-line/v/graphs-using-slope-intercept-form
http://www.mathsisfun.com/equation_of_line.html
https://www.wyzant.com/resources/answers/1247/how_do_you_write_an_equation_with_just_a_graph
http://education-portal.com/academy/lesson/how-to-write-a-linear-equation.html
These are linear if...
Equation: An Equation is linear if there is no exponent in the Equation.
Example: linear: d=10s (d=distance s=seconds) Not linear: d=10d^2 (d=distance s=seconds)
Graph: A graph is linear if the numbers on the x and y axis are going at a constant rate and if the line in the graph is straight.
Table: A table is linear if the independent variable is going at a constant rate and if the dependent variable is going at a constant rare.
http://www.mathplanet.com/education/algebra-1/formulating-linear-equations/writing-linear-equations-using-the-slope-intercept-form
https://www.khanacademy.org/math/algebra-basics/core-algebra-graphing-lines-slope/core-algebra-equation-of-a-line/v/graphs-using-slope-intercept-form
http://www.mathsisfun.com/equation_of_line.html
https://www.wyzant.com/resources/answers/1247/how_do_you_write_an_equation_with_just_a_graph
http://education-portal.com/academy/lesson/how-to-write-a-linear-equation.html
These are linear if...
Equation: An Equation is linear if there is no exponent in the Equation.
Example: linear: d=10s (d=distance s=seconds) Not linear: d=10d^2 (d=distance s=seconds)
Graph: A graph is linear if the numbers on the x and y axis are going at a constant rate and if the line in the graph is straight.
Table: A table is linear if the independent variable is going at a constant rate and if the dependent variable is going at a constant rare.