Question

Solve the following simultaneously equation using cramer rule 3x - 4y = 4x + 3y = 5

Answer 1

3x-4y=5-----------×4 ---------1
4x+3y=5----------×3 ---------2

12x-16y=20--------------3
12x+9y=15---------------4

subtracting 3 and 4 we get

$- 25y = 5\\ y = \frac{35}{25} \\ y = \frac{5}{-25} = 0.2$

Substituting y in 1
3x-4y=5
3x-0.8=5
3x=5.8
$x = \frac{5.8}{3}$

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