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f(0)=0×a+b=-5
f(0)=b=-5
f(-2)=-2×a-5=-9
f(-2)=-2a=4
a=2
jadi a=2 , b=-5
f(0) = - 5 → a(0) + b = - 5
b = - 5
f(-2) = - 9 → - 2a + b = - 9
- 2a - 5 = - 9
- 2a = - 4
a = 2
f(x) = 2x - 5