Calculate the coordinates of a second point on the line. The slope is which is the same as , so the change in the vertical direction is and the change in the horizontal is .
New -coordinate (horizontal):
New -coordinate (vertical):
So a new point on the line is
Plot the new point. Draw a straight line through the two points.
Note: You could also have written the slope as and then added a negative 1 to the -coordinate and added 1 to the -coordinate. In fact, you could have chosen any number you like, say and added its negative to the -coordinate and its positive to the -coordinate (or vice versa), and achieved the same results.
John
My calculator said it, I believe it, that settles it
