Garis ax + 3y – 5 = 0 dan 2x – by – 9 = 0 diketahui berpotongan di titik (2,-1). nilai a+b sama dengan..

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A.6
B.7
C.8
D.9
E.10

Garis ax + 3y – 5 = 0 dan 2x – by – 9 = 0 diketahui berpotongan di titik (2,-1). nilai a+b sama dengan..

Jawaban Terkonfirmasi

Substitusikan titik potong ke kedua persamaan garis
ax + 3y – 5 = 0
2a + 3(-1) – 5 = 0
2a – 3 – 5 = 0
2a – 8 = 0
2a = 8
a = 4

2x – by – 9 = 0
2 . 2 – b(-1) – 9 = 0
4 + b – 9 = 0
b – 5 = 0
b = 5

nilai a + b = 4 + 5 = 9