There are 192 students, ratio is 6:2 - how many do there homework and how many do not
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If all the points have the signs reversed, therefore this means that the whole line is reflected about an axis. Since all are reflected therefore this further means that the new points are still collinear.
We can prove this by plotting the points:
P’(6,2), Q(5,-2), R(4,-6)
<span>From the graph, they are in 1 line hence collinear.</span>
