Question

What is the value of Dy for simultaneous equations 3x+y=1 and 2x-11y=3 ? *

Answer 1

Answer:

Dy=7 It's by determinant method(Cramer's rule )

Answer 2

The value of $\sf D_y$ = 7 for simultaneous equations 3x + y = 1 and 2x - 11y = 3

Given :

The simultaneous equations 3x + y = 1 and 2x - 11y = 3

To find :

The value of $\sf D_y$

Solution :

Step 1 of 2 :

Write down the given equations

The simultaneous equations are

3x + y = 1

2x - 11y = 3

Step 2 of 2 :

Find value of $\sf D_y$

Using Cramer's rule we have

$\displaystyle \sf D_y = \begin{vmatrix} 3 & 1 \\ \\ 2 & 3 \end{vmatrix}$

$\displaystyle \sf{ \implies }D_y = (3 \times 3) - (2 \times 1)$

$\displaystyle \sf{ \implies }D_y = 9 - 2$

$\displaystyle \sf{ \implies }D_y = 7$

The value of $\sf D_y$ = 7