Topic Details (Notes format)

How to Solve Linear Equations (Two Variables)

Subject: Mathematics

Book: Maths Mastery

Systems of linear equations with two variables commonly follow the format: ax + by = c and dx + ey = f. You can solve these using substitution, elimination, or graphical interpretation. For instance, consider the system x + y = 5 and x – y = 1. Adding the two equations gives 2x = 6, so x = 3. Substituting x = 3 back into x + y = 5 yields y = 2. Systems of linear equations model various scenarios—calculating the intersection of supply and demand curves, planning mixture problems, or analyzing motion. A solid understanding of these solutions is essential for real-world planning and higher-level math endeavors.

Practice Questions

The sum of the squares of two consecutive integers is 145. What are the integers?

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What is the area of a sector of a circle with radius 14 cm and central angle 90°?

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If log(100) = 2 and log(10) = 1, what is log(1000)?

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If a = 4 and b = 5, what is the value of (a+b)^2?

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What is the area of a circle with a diameter of 14 cm?

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A number is increased by 20% and then decreased by 20%. What is the net change?

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If x = 2 and y = 3, what is the value of (x^2 + y^2)?

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A man spends 75% of his income and saves Rs. 600. What is his total income?

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A train 150 m long passes a pole in 15 seconds. What is its speed?

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The simple interest on Rs. 4000 at 5% per annum for 2 years is:

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