Diketahu rumus fungsi f(x)=px+q.jika f(4)=19 dan f(11)=47 nilai f(-2) adalah

f(x) = px + q

• f(4) = 19

4p + q = 19

q = 19 – 4p

• f(11) = 47

11p + q = 47

11p + 19 – 4p = 47

7p = 28

p = 4

q = 19 – 4p

q = 19 – 4(4)

q = 19 – 16

q = 3

Fungsi :

4x + 3