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m = 2ax + b
-7 = 4a + b
11 = 10a + b -
- 18 = - 6a
a = -18/-6 = 3
4a + b = -7 ⇔ 4(3) + b = -7
⇔ 12 + b = -7
⇔ b =-7 - 12
b = - 19
a + b = 3 - 19
= - 16 jawaban no 1