the coordinates of the endpoints of line AB and line CD are A(x1, y1), B(x2, y2), C(X3,Y3), and D(x4, y4). which condition prove
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Using the distributive property is the correct first step.
Now, using the associative property of addition, you get
Simplify the right hand side:
Add 5 and
On the left side, use the associative property. On the right, commutativity and associativity:
Simplify.