Question 1163906
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Show by means of slopes that the four points A(0,0), B(-2,1), C(3,4), and D(5,3) are vertices of a parallelogram.<br>
I much prefer a mental picture over the slope formula for determining slopes of lines....<br>
AB: from B to A is right 2, down 1
CD: from C to D is right 2, down 1
AB and CD are parallel<br>
BC: from B to C is right 5, up 3
AD: from A to D is right 5, up 3
BC and AD are parallel<br>
Pairs of opposite sides are parallel; ABCD is a parallelogram.<br>