Click the green flag. Then enter the x value of the coordinates of the first point, enter the y value of the coordinates of the first point, enter the x value of the coordinates of the second point, and enter the y value of the coordinates of the second point. The number on the last row of the screen is the slope. For example, if you want to find the slope of the line that passes through (4,-2) and (-1,2), type "4", then type "-2", then type "-1", then type "2". On the last row on the screen it should say "m= -0.8". So the slope of the line that passes through (4,-2) and (-1,2) is "-0.8". If the result is undefined, it means the line you entered is vertical. This is because the slope formula is m = y2-y1/x2-x1, but in a vertical line the x never changes. So x2-x1 will equal 0. But any number divided by 0 is undefined, so this is why a vertical line's slope is undefined.
The example I used in the instructions is from my Math book. #slope #math #calculator
