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f(4) = a(4) + b=19
4a + b = 19 ...(1)
f(2) = a(2) + b= 7
2a + b = 7 ...(2)
eliminasi
4a + b= 19
2a + b= 7
----------------- -
2a = 12
a = 6
subtitusikan
4(6) + b = 19
24 + b = 19
b = -5
rumus fungsi.
f(x) = 6x -5