Question: "A line in the $xy$-plane contains the points $(5, 4)$ and $(2, –1)$. Which is bigger: a) the slope of the line or b) $0$."
Result: They draw out the figure and say "you can see that the line through the two points slants upward and to the right. So the slope of the line is greater than $0$.
Conflict: However, when I use the formula to find the slope:
The result I receive is $-1$.