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Y = -1
Jawab
4x+ by = 9
4b+ b(-1) = 9
4b + -b = 9
3b = 9
b = 3
4b - b = 9
3b = 9
b = 3 (C)
2. 2x +by = -1
4 + b = -1
b = -5 (B)
3. uji coba
a. 8 + 3 ≠ 8
b. 15 + 0 ≠ 8
c. 2 - 6 ≠ 8
d. -1 + 9 = 8
Jawaban D