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If some lines go through the same point, then they are concurrent.

Any 2 lines which are not parallel intersect at some point, so any 2 non-parallel lines are concurrent.

3 or more lines may or may not go through the same line.

To determine if 3 or more lines are concurrent, we find the point of intersection of two of these lines, and then see whether this point lies on the other lines.

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Question 1/5

1. Which of the following are concurrent?

y = x + 3, y = + , y = - -

y = -x + 1,  y = 2x + 7,  y = - +

none of the others are concurrent


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