Chapter 4 · Class 9 CBSE · Formula Sheet
Linear Equations in Two Variables Formulas — Class 9 CBSE
Form and graph linear equations in two variables; find solutions as ordered pairs.
Key Formulas
Standard Form
ax + by + c = 0
Solution
\text{An ordered pair } (x, y) \text{ that satisfies the equation}
Graph
\text{Every linear equation in two variables is a straight line}
Equation of x-axis
y = 0
Equation of y-axis
x = 0
Worked Examples
1Using: Supplementary Angles
If one angle is 65 degrees, find its supplement.
Step 1: Supplement = 180 - 65
Step 2: = 115 degrees.
Answer: 115 degrees
2Using: Vertically Opposite
Two lines intersect. If one angle is 40 degrees, find the vertically opposite angle.
Step 1: Vertically opposite angles are equal.
Step 2: The angle = 40 degrees.
Answer: 40 degrees
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