Question

vreau punctele a b c doar VA ROG URGENT DAU COROANA ​

Answer 1

Răspuns:

a) x = 5, y = -2; b) x = 4, y = 0; c) x = 3, y = -2

Explicație pas cu pas:

a) { 6x + 5y = 20 | ×4

{-7x + 4y = -43 | ×(-5)

{24x + 20y = 80

{35x - 20y = 215

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59x = 295 => x = 5

30 + 5y = 20

5y = -10 => y = -2

b) {x + 12y = 4

{-x - 2y = -4

‐---------------

10y = 0 => y = 0 => x = 4

c) {4x + 15y = -18

{ x + 4y = -5 | ×(-4)

{4x + 15y = -18

{-4x - 16y = 20

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-y = 2 => y = -2

x - 8 = -5 => x = 3