Question

http://prntscr.com/9ysdva
Can you explain how she found the missing coordinate? I'm lost. Will medal.

Answer 1

The trick of this question is to look at the change in length between the origin and the point along the x-axis and the change in length between the origin and the point along the y-axis.

Since this shape is assumed to be a parallelogram, the change in x-displacement between Q and P should be EQUAL to the change in x-displacement between R and O; likewise, the change in y-displacement between Q and R should be EQUAL to the change in y-displacement between P and O. So the first thing you need to find are the change in length between R and O in terms of x-displacement and the change in length between P and O in terms of y-displacement.

From there, when you have values (hint: you won't have numerical values, you'll have constants given in the problem) for the changes, you simply add them to the values of the original point to get the final point coordinates.

Answer 2

I know it's a little long-winded, but I want you to walk through the steps and see how to do this! Let me know if you get caught up or stuck with anything!

Answer 3

@AakashSudhakar
How do I calculate the length? With slope formula right?