**1**To recognize variables representing date on each axis of Cartesian coordinates.**1.1**Identify the variable represented by the x-axis.**1.2**Identify the variable represented by the y-axis.

**2**To extract from the graph the meaning of Cartesian coordinate origin.**2.1**Determine the meaning of zero on the x-axis for the situation.**2.2**Determine the meaning of zero on the y-axis for the situation.**2.3**Determine the meaning of coordinate origin for the situation.

**3**To determine the meaning of unit based on the axes of Cartesian coordinates.**3.1**Determine what a unit on the x-axis represents.**3.2**Determine what a unit on the y-axis represents.

**4**To establish a relationship between variables in order to find the value of one variable based on the other.**4.1**Determine the value of each variable with respect to the other.**4.2**Determine whether or not a given point belongs to the graph.

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