CBSE CLASS 10 BOARD 2024 ALL IMPORTANT QUESTIONS

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CLASS 10 CHAPTER 3 (LINEAR EQUATION IN TWO VARIABLES )
CROSS MULTILICATION METHOD
cross multiplication method is used to solve linear equation in two variables. This is the simplest method and gives the accurate value of the variables. Cross multiplication is only applicable when we have a pair of linear equations in two variables.
Let us suppose that a1x + b1y + c1 = 0 and a2x + b2x + c2 = 0 are the two equations which has to be solved. By using cross multiplication, we will get the values x and y such as:
Let’s assume that we have to find solution for a1x + b1y + c1 = 0 (i) and a2x + b2y + c2 = 0 (ii)
Step 1: Multiply Equation (i) by b2 and Equation (ii) by b1, to get
b2a1x + b2b1y + b2c1 = 0 ---(iii)
b1a2x + b1b2 y + b1c2 = 0 ----(iv)
Step 2: Subtracting Equation (4) from (3), we get:
(b2a1 – b1a2) x + (b2b1 – b1b2) y + (b2c1– b1c2) = 0
Or (b2a1 – b1a2) x + (b2c1– b1c2) = 0
Or x = (b1c2– b2c1)/ (a1b2 – a2b1)
Step 3: Substituting this value of x in (i) or (ii), we get
y = (c1a2 – c2a1)/ (a1b2 – a2b1)
Step 4: Calculate value of a1b2 – a2b1
Step 5: if a1b2 – a2b1 ≠ 0 or a1/a2 ≠ b1/b2, then equation has definite solution.
Step 6: if a1b2 –a2b1 =0 or a1/a2 = b1/b2, then there are two possibilities
Memory tip:
1.Solve using x – 3y – 3 = 0 ; 3x – 6y –12 =0; cross multiplication method
2. Solve x – 3y – 3 = 0 ; 3x – 6y –12 = 0 using cross multiplication method
3. Solve x – 3y – 3 = 0 ; 3x – 9y –9 = 0 using cross multiplication method
4.Solve the two variables linear equation:
8x + 5y = 11
3x – 4y = 10
5.Find the value of x and y by using the using cross-multiplication method:
3x + 4y – 17 = 0
4x – 3y – 6 = 0
6.Solve the system of linear equations:
ax + by – c² = 0
a²x + b²y – c² = 0
7.Solve the pair of equations: 6x + 3y = 6xy, 2x + 4y = 5xy.
8. x – 3y – 3 = 0, 3x – 9y – 2 = 0
9. 2x + y = 5, 3x + 2y = 8
10. 3x – 5y = 20, 6x – 10y = 40
11.x – 3y – 7 = 0, 3x – 3y – 15 = 0
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