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y = teman ku
1. 3x + y = 5
y = 5 - 3x
2. 4x + 3y = 8
4x + 3 (5-3x) = 8
4x + 15 - 9x = 8
15 - 5x =8
- 5x = 8 - 15
- 5x = -7
x =
3. 3x + y = 5
3 × + y = 5
+ y = 5
y = 5 - 4
y =
jadi aku mempunya nilai dan teman ku mempunyai nilai