Question

Solving by substitution​

Answer 1

* يدرج صوت سيارة الإسعاف*

Answer 2

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y = -9x -26

=> 9x + y = -26 × 2

=> 18x + 2y = -52 ....(i)

- 2x -7y = -1

=> 2x + 7y = 1 × 9

=> 18x + 63y = 9 ....(ii)

From (i) & (ii) ,

18x + 02y = -52

18x + 63y = 09

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-61 y = – 61

=> y = 1

2x + 7y = 1

=> 2x + 7×1 = 1

=> 2x = 1-7

=> x = $\frac{-6}{2}$

=> x = -3

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