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You can easily visualise positive and negative numbers on a number line

Parallel lines are not intersecting while perpendicular lines are intersecting and form a right angle

A line that intersects two coplanar lines in two distinct (different) points is called a transversal

When 0 is added to an integer, the integer number remains the same

Like terms and unlike terms

To evaluate expressions that contain several additions, we make repeated use of the rules for adding two integers.

Pressure in a liquid increases with depth below the surface

Rules and properties to understand in order to successfully solve an algebraic equation

There are many application problems that can be solved by adding integers. Here are few of them.

We translate the words of the problem into a percent equation and solve it.