1. Jika suatu fungsi dengan rumus f( x ) = mx + n dan f ( 1 ) = 5 dan f( -2 ) =14, tentukan: a. Nilai m dan n b. Rumus fungsi c. Jika f( a)= 1, berapa n

f(x) = mx + n
f(1) = m(1) + n = 5
m + n = 5
m = 5 - n

f(-2) = m(-2) + n = 14
-2m + n = 14
-2(5-n) + n = 14
-10 + 2n + n = 14
3n = 24
n = 8

m = 5 - n = 5 - 8 = -3

a) m = -3 dan n = 8

b) rumus fungsi
f(x) = -3x + 8

c) f(a) = -3a + 8 = 1
-3a = -7
a = 7/3

2a = 2(7/3) = 14/3

f(2a) = -3(14/3) + 8
= -14 + 8
= -6