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permisalan ,
f(x) = ax + b (krn linear)
maka
f(0) = b = -5
f(-2) = -2a +b
-9 = -2a - 5
-9 +5 = -2a
-4 = -2a
a = -4/-2
a = 2
Fungsinya
f(x) = 2x - 5