What is the difference between
Y1=MX1+B and Y=MX+B
its pointless in life
Not all that much really. The little ones (1's) are just ways of differentiating between different coordinates so you do not get confused as to which set belongs with which point in the grid.
The difference between the equations Y1=MX1+B and Y=MX+B lies in the choice of variables used.
In the equation Y1=MX1+B, the variables are Y1 and X1. This equation represents the equation of a line where Y1 is the dependent variable, X1 is the independent variable, M is the slope of the line, and B is the y-intercept.
On the other hand, in the equation Y=MX+B, the variables are Y and X. This equation also represents the equation of a line, where Y is the dependent variable, X is the independent variable, M is the slope of the line, and B is the y-intercept.
The key difference lies in the choice of variable names. The equations have the same form and represent the same concept of a straight line, but the choice of different letters for variables does not affect the underlying mathematical principles or how the equations are used.