Question

Y=5x-10/2, 4x+5=-y (find the determinant in carmeras rule) pls help

Answer 1

Answer:

Sol. y = (5x – 10)/2

∴ 2y = 5x – 10

∴ – 5x + 2y = – 10

Changing the sign,

∴ 5x – 2y = 10

Now, 4x + 5 = – y

∴  4x + y = – 5

D

=

5

-2

=

(5 × 1) – (4 × -2)

=

5 + 8

=

13

4

1

DX

=

10

-2

=

(10 × 1) – (-5 × -2)

=

10 – 10

=

0

-5

1

DY

=

5

10

=

(5 × -5) – (4 × 10)

=

-25  - 40

=

-65

4

-5

 

∴ x = 0 and y = – 5 is the solution of given simultaneous equations.