Question

tolong bantu dan jelaskan ya kak makasih

Answer 1

Penjelasan dengan langkah-langkah:

1. eliminasi

3x + y - 11 = 0

2x - y - 4 = 0

__________ +

5x - 15 = 0

5x = 15

x = 15/5

x = 3

substitusi x = 3

3x + y - 11 = 0

3(3) + y - 11 =0

9 + y - 11 = 0

y - 2 = 0

y = 2

x - 2y = 3 - 2(2) = 3 - 4 = -1

2.

1/2 x + y = 8 ...dikali 2

x + 2y = 16

3x - 1/2 y = 9 ... dikali 2

6x - y = 18

eliminasi

x + 2y = 16 |×1 | x + 2y = 16

6x - y = 18 |×2 | 12x - 2y = 36

___________ +

13 x = 52

x = 52/13

x = 4

substitusi x = 4

x + 2y = 16

4 + 2y = 16

2y = 16 - 4

2y = 12

y = 12/2

y = 6

4x - 3y = 4(4) - 3(6) = 16 - 18 = -2