Tentukan himpunan penyelesaian SPLDV berikut dengan cara substitusi! A.4x+2y=8 dan x+2y=4 B.5a-b=3 dan a+b=2

A.
4x + 2y = 8
x + 2y = 4

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

4x + 2y = 8
4(4 - 2y) + 2y = 8
16 - 8y + 2y = 8
- 6y = 8 - 16
- 6y = - 8
y = 8/6
y = 1⅓

x = 4 - 2y
x = 4 - 2⅔
x = 1⅓

B.
5a - b = 3
a + b = 2

a + b = 2
a = 2 - b

5a - b = 3
5(2 - b) - b = 3
10 - 5b - b = 3
- 6b = 3 - 10
- 6b = - 7
b = 7/6
b = 1 1/6

a = 2 - b
a = 2 - 7/6
a = 5/6

Maaf Kalau Salah