Learn what a linear relation is and how to distinguish a linear relationships from another relationship.
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Learn about parallel lines and their properties. How are the slopes of parallel lines related? Practice finding the equations of parallel lines.
Learn what the slope of a line is in the Cartesian plane, . Practice finding the slope of lines.
Two lines on the Cartesian plane are either parallel or intersecting. If lines are intersecting, we want to find where they cross or their point of intersection.
What are first differences? When given a function or a table of values representing a function, looking at the first difference can help you determine what kind of relationships there is between the variables and hence what function the points represent.