Question

Ex 4,5 va rog ( daca se poate le un caiet, sa inteleg scrisul)

Answer 1

x√2 - y = 4

2√2×√2 - 0 = 4

2×2 - 0 = 4

4 - 0 = 4 (A)

0,5x + 5y = √2

1/2×2√2 + 0 = √2

√2 + 0 = √2

√2 = √2 (A)

______________________

x + y = 9

5 + 4 = 9

9 = 9 (A)

2x - y = 0

2×5 - 4 = 0

10 - 4 = 0

6 = 0 (F)

2x  - y = 6

2×5 - 4 = 6

10 - 4 = 6

6 = 6 (A)

3x + y = 9

3×5 + 4 = 9

15 + 4 = 9

19 = 9 (F)

x - y = 1

5 - 4 = 1

1 = 1 (A)

- x + 2y = 3

- 5×5 + 2×8 = 3

- 25 + 16 = 3

- 9 = 3 (F)