Răspuns :

a = 7x

b = 7y

a + b = 35

7x + 7y = 35

7(x + y) = 35

x + y = 35÷7

x + y = 5

x = 1 ; y = 4 => a = 7 ; b = 28

x = 2 ; y = 3 => a = 14 ; b = 21

x = 3 ; y = 2 => a = 21 ; b = 14

x = 4 ; y = 1 => a = 28 ; b = 7

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