01 · GRAPH REPRESENTATION
Straight Line Graph
The geometrical representation of every linear equation in two variables is a straight line. Every point (x, y) on the line satisfies the equation.
STEPS TO DRAW GRAPH
Graphing Procedure
1. Express y in terms of x: y = (c - ax) / b.
2. Choose at least 3 values of x and calculate corresponding values of y to form coordinate pairs (x, y).
3. Plot the coordinate points on a Cartesian graph sheet.
4. Join the points with a ruler to draw the continuous straight line.
02 · LINES PARALLEL TO AXES
Equations of Lines Parallel to Axes
SPECIAL LINES
x = a and y = b
• Equation of X-axis: y = 0
• Equation of Y-axis: x = 0
• Line Parallel to X-axis: y = k (or y = b)
• Line Parallel to Y-axis: x = k (or x = a)