Question

For simaltaneous equation in variable x & y,

Dx= 45, Dy = -63, D = 9 then find the vaiue of

x& y.​

Answer 1

Given :-

• For simultaneous equations in variables x and y.

• Dx = 45 , Dy = -63 , D = 9.

To Find :-

• Value of y.

Solution :-

According to Cramer's rule,

x = Dx/D OR y = Dy/D

[ First solve for "x" ]

↪ x = 45/9

↪ x = 5

[ Now, solve for "y" ]

↪ y = -63/9

↪ y = -7

Hence,

• The value of x and y is 5 & -7 respectively.

For information:

• a² - b² = (a - b)(a - b)
• (a + b)² = a² + 2ab + b²
• a² + b² = (a + b)² - 2ab
• (a - b)² = a² - 2ab + b²
• (a + b)³ = a³ + 3a²b + 3ab² + b³
• (a - b)³ = a³ - 3a²b + 3ab² - b³
• a³ - b³ = (a - b)(a² + ab + b²)
• a³ + b³ = (a + b)(a² - ab + b²)