Question

Solve 3x - 4y = 10 ; 4x + 3y = 5 using Cramer's rule
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Answer 1

$3x - 4y = 10 \\ 4x + 3y = 5 \\ therefore \: = > dx \: = ( \frac{10}{5} - \frac{4}{3} ) = 10 \times 3 - 5 \times ( - 4) = 30 + 20 = 50 \\ therefore = > dy = ( \frac{3}{4} \times \frac{10}{5} ) = 3 \times 5 - 4 \times 10 = 15 - 40 = - 25$

Answer 2

Answer:

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