diketahui fungsi f(x)=ax + b, jika f(5)=4 dan f(10)=14 tentukan: 1) nilai a dan b 2) rumus f(x) 3) f(2) dan f(8) 4) nilai p jika f(p)= -8 5) nilai q jika f(q)=

f(x) = ax + b
f(5) = 4 >>> 4 = 5a + b
f(10) = 14 >>> 14 = 10a + b

4 = 5a + b
14 = 10a + b
------------------- -
-10 = -5a
a = 2

maka,
4 = 5a + b
4 = 10 + b
b = -6

1) a = 2, b = -6
2) f(x) = 2x - 6
3) f(2) = -2 , f(8) = 10
3) f(p) = -8
-8 = 2p - 6
2p = -2
p = -1

4) f(q) = -12
-12 = 2q - 6
2q = -6
q = -3