In mathematics, graphs are used to illustrate the information presented in the form of equations.

These equations contain two variables that information is derived from

The variables x and y take the place of solutions of an equation that are written as an **ordered pair of real numbers, (x,y)**.

To find the ordered pairs that satisfy a function. An **input value** can be chosen as the x-value (any real number) and an **output value **will be given as the y-value representing one of many ordered pairs.

**What is the Rectangular Coordinate System**

So the** rectangular coordinate system** has a vertical number line, the **y- axis**, and horizontal number line, the** x-axis**, that are indeed perpendicular and intersect at the **origin,** (0,0).

These two number lines also illustrate that there are 4 **quadrants** in the plane.

**Plot Points in the Coordinate System**

To be asked “to graph” a point. Takes the same meaning as “to plot” a point.

To graph a point we declare x and y values as a **coordinate pair **that gives us the location of the point in the plane.

This pair is represented by the **ordered pair (x,y)**. For example, the origin is the coordinate of 0 on the x-axis and 0 on the y- axis thus the ordered pair for the origin is (0,0).

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