Y = mx + b is the slope intercept form of a linear equation. m is the slope and b is the y intercept. To find the y intercept you want to find the point where the graph crosses the y axis. On this graph you can see that it is 1. The slope is rise/run. This is 2/1, so slope is 2. Putting these into the equation we get y = 2x + 1 This is not an option because the answers are in standard form. Changing to standard form we get 2x - y = -1 Letter C
