Question

find the value of x and y .​

Answer 1

Step-by-step explanation:

$1. \\ \\ 5x + 8y = 18 \times (2)\\ 2x - 3y = 1 \times (5) \\ ^{ - } = ^{ + } = = ^{ - } = = = \\ \: \: \: 16y + 15y = 31 \\ \\ \\ y = \frac{31}{31} = 1 \\ \\ \\ 2x - 3y = 1 \\ 2x - 3 \times 1 = 1 \\ \\ x = \frac{4}{2} = 2 \\ \\ \\ \\ \\ \\ \\ 2. \frac{x}{3} + \frac{y}{5} = 1 \\ \\ \\ 7x - 15y = 21 \\ 5x + 3y = 15 \times (5)\\ ^{ + } = ^{ + } = = ^{ + } = = \\ 32x =96 \\ \\ x = \frac{96}{32} = 3 \\ \\ 7x - 15y = 21 \\ = > 7 \times 3 - 15y = 21 \\ \\ \\ = > 21 - 15y = 21 \\ \\ \\ = > - 15y = 0 \\ y = 0 \\ \\ \\ \\ \\ 3. \\ 3x + y = 5 \times (3) \\ 5x + 3y = 3 \\ - \: \: - \: \: \: - \\ = = = = = = = = \\ 4x = 12 \\ x = \frac{12}{4} \\ \\ x = 3 \\ \\ 3x + y = 5 \\ 3 \times 3 +y = 5 \\ \\ y = - 4$

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