Mathematicians call y the dependent variable because its value depends on what happens on the other side of the equation. I don't care what m is. We must move down 1. Now let's go the other way. I don't see any b term. Where is the b? Where is this x term? When you move up by 1 in x, you go down by 1 in y.
In the slope-intercept form of a straight line, I have y, m, x, and b. This is just the y value.
Let me write that.