A farmer had a total of 995 horses and cows. After selling some of the horses and cows, he had 510 horses and 390 cows left. How
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This is a vertical line. Vertical lines are composed by points who share the same x coordinate.
That's why the equation of the line is exactly , where k is the shared x coordinate.
In your case, the common x coordinate is 3, so the line is
