PRECALCULUS  
UNIT 1: FUNCTIONS & GRAPHS OF FUNCTIONS
1.1 LINES AND GRAPHS
The slope (Meaning or Definition): The slope of a line is the number of units that a line rises or drops vertically for each unit of horizontal change heading in the (right direction). Note that the rise of a slope has a sign either negative(down) or positive (up) but the run is always to the right. 
Forms of the Equation of a Line
The general form of the equation of a line is given by Ax+By+Cy=0
The slope intercept form of the equations of a line is given by y=mx+b
The point slope form of the equation of a line is given by y-y1=m(x-x1)
The vertical form of the equation of a line is given by x= a
The horizontal form of the equation of a line is given by y = b
Strategy to Write the Equation of a Line Given The Slope and Y-intercept
  1. Write down the slope intercept formula for the equation of a line y=mx+b.
  2. Assign the values of the slope to m and the y- intercept to b.
  3. Substitute the values into the slope intercept form of the equation of a line. 
Strategy to Write the Equation of a Line Given The Slope and a Point
  1. Write down the point slope form of the equation of a line y-y1=m(x-x1) .
  2. Assign the values of the slope to m and the coordinate values of the point to x1 and y1.
  3. Substitute the values into the slope intercept form of the equation of a line. 
1-2 FUNCTIONS: TEST, EVALUATION,DOMAIN AND COMPOSITION
Definition  (Meaning) of a Function:
A function from a set A to a set B is a relation that assigns to each element x in the set A, exactly one element y in set B. Set A is the domain and set B is the range.
  
VIDEO TUTORIAL
1-3 GRAPHS OF FUNCTION AND ITS PROPERTIES
Definition  (Meaning) of a Domain and Range:
Graphically the domain can be described as the horizontal span of the graph of a function when it is projected on the x-axis. The domain can be thought of as the width of the graph of a function. The range on the other hand is the vertical span of the graph of a function when it is projected on the y-axis. It can be thought of as the height of a function. 
VIDEO TUTORIAL ON DOMAIN RANGE BEHAVIOR & EXTREMA
PRECALCULUS FORMULA COLLECTION
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