Question

Determinati numerele A,b,c si d din tabelul de mai jos


5x+3y=27 A=100+10x+6y

4+2x+7y=15 B=20+10x+35y

x+5y=23 C=3x+15y-42

3x-2y-4=18 D=12x-8y

Answer 1

5 x + 3 y = 27

A = 100 + 10 x + 6 y

A = 100 + 2 × ( 5 x + 3 y )

A = 100 + 2 × 27

A = 100 + 54

A = 154

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4 + 2 x + 7 y = 15

B = 20 + 10 x + 35 y

B = 5 × ( 4 + 2 x + 7 y )

B = 5 × 15

B = 75

______________

x + 5 y = 23

C = 3 x + 15 y - 42

C = 3 × ( x + 5 y ) - 42

C = 3 × 23 - 42

C = 69 - 42

C = 27

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3 x - 2 y - 4 = 18  ⇒   3 x - 2 y = 18 + 4 ⇒  3 x - 2 y = 22

D = 12 x - 8 y

D = 4 × ( 3 x - 2 y )

D = 4 × 22

D = 88