slope of (1,1),(4,-1/2)
The slope between the two points is y₂ -y₁x₂ -x₁: -12 -14 -1
⇥ℹ-12 -1 = -1 -1·22‖4 -1 = 3
⇥ -1 -1·223
⇥ -1 -223
⇥ -323
⇥ -323
⇥ -32·13
⇥ -36
▶Slope:   -12