Class VIII Mathematics
Chapter 11: Direct and Inverse Proportions
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Syllabus Sections
Key Formulas & Equations
Click Copy to duplicateDirect Proportion
\frac{x_1}{y_1} = \frac{x_2}{y_2}
Ratio remains constant.
Inverse Proportion
x_1 y_1 = x_2 y_2
Product remains constant.
Related Formulas from Adjacent Chapters
Negative Exponent Law
a^{-n} = \frac{1}{a^n}
[From Exponents and Powers] Negative index represents reciprocal power.
Trinomial Factorisation
x^2 + (a+b)x + ab = (x+a)(x+b)
[From Factorisation] Factors quadratic trinomial into product of binomials.