To find the slope of the line that passes through the points (1, 2) and (2, 1), we can use the slope formula:
m = (y2 – y1) / (x2 – x1)
Where:
- (x1, y1) = (1, 2)
- (x2, y2) = (2, 1)
Now, plug in the values:
m = (1 – 2) / (2 – 1)
This simplifies to:
m = (-1) / (1)
Which equals:
m = -1
So, the slope of the line that connects these two points is -1.