Fungsi f dinyatakan dengan rumus f(x) = px + q jika f(3) = -10 dan f(-2)=0, nilai f(-7) adalah​

Jawab:

f(-7) = 10

Penjelasan dengan langkah-langkah:

f(x) = px+q

f(3) = -10

3p+q = -10

q = -10-3p      …(i)

f(-2) = 0

-2p+q = 0

-2p+(-10-3p) = 0      …substitusikan pers. (i)

-5p-10 = 0

-5p = 10

p = -2   → q = -10-3(-2) = -4

maka f(x) = -2x-4

f(-7) = -2(-7)-4 = 14-4 = 10