Suatu fungsi f(x) = mx + n jika f(-2) = -9 dan f(3) = 11. Tentukan : a.nilai m dan n b.rumus fungsi

f(x) = mx + n
f(-2) = - 2m + n = - 9
f(3) = 3 m + n = 11
----------------------------(-)
- 5m = - 20
m = 4
3m + n = 11
3(4) + n = 11
12 + n = 11
n = 11 - 12
n = - 1

b) f(x) = 4x - 1