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Ответ:

Объяснение:

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Ответ:

1) a = 10

2) a = 1

Объяснение:

1) ax + 5y = 40

(3,2) => x= 3, y =2

a*3 + 5 * 2 = 40

3a = 40 - 10

3a = 30

a = 30:3

a = 10

2) 2x + 7y = 16

(a, 2a) => x =a, y = 2a

2*a + 7*2a = 16

2a + 14a = 16

16a = 16

a = 16:16

a = 1