Find the value of the slope.
Slope is equal to the change in y over the change in x, or rise over run.
m=change in ychange in x
The change in x is equal to the difference in x-coordinates (also called run), and the change in y is equal to the difference in y-coordinates (also called rise).
Substitute in the values of x and y into the equation to find the slope.
Multiply -1 by 1.
Subtract 1 from 1.
The expression contains a division by 0 The expression is undefined.
Since the slope is undefined, this is a vertical line. Vertical lines have no y-intercept.
The slope is undefined and there is no y-intercept.
Find the Slope and Y-Intercept (1,-4) , (1,-5)