fungsi f dinyatakan dengan rumus f(x)=ax+b. jika f(5)=20 dan f(-5)=-30, maka dari nilai f(0)...

f(x) = ax + b
f(5) = 5a + b
20 = 5a + b
f(-5) = -5a + b
-30 = -5a + b

Pakai metode eliminasi campuran
20 = 5a + b
-30 = -5a + b
--------------------- +
-10 = 2b
b = -5

20 = 5a + b
20 = 5a - 5
20 + 5 = 5a
a = 5

f(0) = (5.0) - 5
f(0) = -5

semoga membantu