Diketahui f(x)=ax+b. Jika f(-2)=-15 dan f(4)=-3, nilai a + b adalah

jawab
fungsi

f(x) = ax + b
f(-2) = - 15
f(4) = - 3 ......(-)
(-2- 4) a = -15 - (-3)
-6a = - 12
a = 2

f(4) = 3
b = 3 - 4a
b = 3-4(2)
b = - 5

a+ b = 2 - 5 = - 3