(-4, 4.2) and (3, -2.8)

(x₁, y₁) and (x₂, y₂)

(4.2, -4) and (-2.8, 3)

(x₁, y₁) and (x₂, y₂)

(4.2, -2.8) and (-4, 3)

(x₁, y₁) and (x₂, y₂)

(4.2, 3) and (-2.8, -4)

(x₁, y₁) and (x₂, y₂)

$$\left(\frac{4.2+\left(-2.8\right)}{2},\frac{-4+3}{2}\right)$$  

$$\left(\frac{4.2+\left(-4\right)}{2},\frac{-2.8+3}{2}\right)$$  

$$\left(\frac{-4+3}{2},\frac{4.2+\left(-2.8\right)}{2}\right)$$  

$$\left(\frac{4.2+\left(3\right)}{2},\frac{-4+\left(-2.8\right)}{2}\right)$$  

(-0.7, 0.5)

(0.7, 0.5)

(-0.7 -0.5)

(0.7, -0.5)