suatu fungsi ditentukan dengan rumus f (x)=ax+b.jika diketahui f(4)=5 dan f(-2)= -7,maka nilai dari f(-4) adalah

Materi : Fungsi

f(x) = ax + b

f(4) = 4a + b
5 = 4a + b

f(-2) = -2a + b
-7 = -2a + b

4a + b = 5
-2a + b = -7
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6a = 12
a = 2

5 = 4x + b
5 = 4(2) + b
b = 5 - 8
b = -3

f(x) = ax + b
f(-4) = -4(2) + (-3)
f(-4) = -8 - 3
f(-4) = -11

F(x)=ax+b
f(4) = 4a +b= 5
f(-2)=-2a +b=-7
--------------------- -
6a =12
a =12/6=2
Di masukkan k rumus
f(4)= 4a+b=5
=4.2+b=5
8+b=5
b=5-8
b=-3

f(-4)=ax+b
2(-4)+(-3)
=-8-3=-11