Question

`A(4, 0), B(1, 5) and C(-3, -5)` are three vertices of a parallelogram. What is the coordinates of `D`, the fourth vertex of the parallelogram?

Answer 1

`D=(0,-10)`

Explanation:

The line from B to C, the x coordinate goes from 1 to -3, `Deltax = -4`, and the y coordinate goes from 5 to -5, `Deltay=-10`
The line from A to D must do the same `D = (4-4,0-10)`