Dik = f(x)=ax+b f(3)=9 f(-3)=15 Dit = tentukan nlai dari f(-2) + f(2) F(x)=ax+b f(-3)=-15 f(3)=9 Dit = f(-2) f(2) Dgn Cara nya Ok

f(3) = 9
3a + b = 9

f(-3) = -15
-3a + b = 9

Eliminasi
3a + b = 9
-3a + b = 15
------------------ + (ditambah, a tereliminasi) 
2b = 24
b = 12

Substitusi
3a + b = 9
3a + 12 = 9
3a = -3
a = -1

diperoleh a = -1 dan  b = 12

Mencari f(2)
f(x) = ax + b
f(2) = -1(2) + 12
f(2) = -2 + 12
f(2) = 10

Mencari f(-2)
f(x) = ax + b
f(-2) = -1(-2) + 12
f(-2) = 2 + 12
f(-2) = 14

f(2) + f(-2) = 10 + 14
f(2) + f(-2) = 24

CMIIW