Question

помогите пж дам 30 баллов​

Answer 1

Ответ:

Объяснение:

1)

• x/2 - y/3 = 1
• 6x - 5y = 3

• (3x - 2y)/6 = 1
• 6x = 3 - 5y

• 3x - 2y = 6
• x = (3 - 5y)/6

• x = (3 - 5y)/6
• 3((3 - 5y)/6) - 2y = 6

• x = (3 - 5y)/6

• (3 - 5y)/2 - 2y = 6

• x = (3 - 5y)/6
• (3 - 5y - 4y)/2 = 6

• x = (3 - 5y)/6
• 3 - 5y - 4y = 12

• x = (3 - 5y)/6
• y = -1

x = (3 - 5y)/6 = 8/6 = 4/3

Ответ: (4/3; -1)

2)

• x/4 - y/3 = 4
• 4x/5 - 3y = 7

• (3x - 4y)/12 = 4
• (4x - 15y)/5 = 7

• 3x - 4y = 48
• 4x - 15y = 35

• x = 16 + 4y/3
• 4(16 + 4y/3) - 15y = 35

• x = 16 + 4y/3
• 64 + 16y/3 - 15y = 35

• x = 16 + 4y/3
• 192 + 16y - 45y = 105

• x = 16 + 4y/3
• 29y = 87

• y = 3

• x = 16 + 4y/3 = 20

Ответ: (20; 3).