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f(4) = 4a + b = 18
f(-1) = -a + b = 18
*cara eliminasi
4a + b = 18
-a + b = 18 -
5a = 0
a = 0
*cara subtitusi
4a + b = 18 → a = 0
4(0) + b = 18
0 + b = 18
b = 18
karena a = 0 dan b = 18, maka a + b = 0 + 18 = 18