SOLUTION: (1,7)(6,r) how to find the missing coordinate r?

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Question 1010618: (1,7)(6,r) how to find the missing coordinate r?
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.
Do these points lie in one straight line?
Does this straight line pass through the origin of the coordinate system?

Why do not say it explicitly and directly?