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Linear equations in 2 variable

Shubham Agrawal
IIT Roorkee Grad. IIM L |Dropout. SBI PO 2017 Topper and Dropout. Full Time Educator.

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1. About Me Shubham Agrawal IIT Roorkee 2013 graduate IIM Dropout SBI PO under 100 ranker (dropout) Left job to pursue my passion- Education

2. Linear Equation with 2 variables

3. Concept Usually of the form ax + by +c o Represents a line in x y plane For every value of x, there's a corresponding value of

4. Concept If there are 2 equations of the form 1st Method 2 2. 25 , b CA 2 2. 2.

5. Question -2

6. Question

7. Concept If there are 2 equations of the form 2nd Method Subtract or add one equation with the other to eliminate either x or y

8. Question -2

9. Question .

10. Concept Needs 2 equations to find the unique value of the 2 variables If i then infinitely many solution (as it's a2 b2 C2 the same equation)

11. Applications Q. The sum of the digits of a two digit number is 16 If the number formed by reversing the digits is less than the original number by 18. Find the original umber.

12. Applications Q. The sum of the digits of a two digit number is 16 If the number formed by reversing the digits is less than the original number by 18. Find the original umber.

13. Applications Q. The ratio of the ages of the father and the son at present is 3: 1. Four years earliar, the ratio was 4: 1. What are the present ages of the son and the father? 2 Methods: