Question

Tolng jawab segera. pakai cara

Answer 1

1. a - 2 = b + 6 (C)
a - b = 6 + 2
a - b = 8

2. 2x = 4a
x = 4a : 2 = 2a (B)

3. 4x - 5 = 2x + 7
4x - 2x = 7 + 5
2x = 12
x = 12 : 2 = 6 (D)

4. x + y = 6
x - y = 2
----------------(-)
2y = 4
y = 4 : 2 = 2

x + y = 6
x + 2 = 6
x = 6 - 2 = 4

HP = [{4, 2}] (C)

6. 2x + y = 6 Ι x3
3x - y = 14 Ι x2
-----------------------
6x + 3y = 18
6x - 2y = 28
------------------(-)
5y = -10
y = -10 : 5 = -2

2x + y = 6
2x + (-2) = 6
2x = 6 + 2
x = 8 : 2 = 4

HP = [{4, -2}] (D)