Question

if 3x-y=7,ax+4y=11 and Dy=26 then a=​

Answer 1

Given :  3x - y = 7

ax + 4y = 11

Dy =  26

To Find :  Value of a

Solution:

Using Cramer rule :

x = Dₓ/D

y = Dy/D

3x  -  y = 7

ax + 4y = 11

$D=\left|\begin{array}{ccc}3&-1\\a&4\end{array}\right|$

$D_x=\left|\begin{array}{ccc}7&-1\\11&4\end{array}\right|$

$D_y=\left|\begin{array}{ccc}3&7\\a&11\end{array}\right|$

=> 3 * 11  - 7a = 26

=> -7a = -7

=> a = 1

Hence value of a = 1

on Solving x = 3 and y = 2

Learn More:

Q.1) Solve the following linear equations byusing Cramer's Rule.i) x ...

brainly.in/question/11892524

solve 6x-7y=16,9x-5y=35 using cramer rule.​ - Brainly.in

brainly.in/question/12339162