Question

Fungsi f dirumuskan f(x)=ax+b dengan adan b bilanggan bulat . jika f (5)=-7dan f(-3)=9, berapa nilai f(1)??

Answer 1

F(x)=ax+b
a dan b bil bulat
f(5)=-7
f(-3)=9

f(1)=??

f(5)=a(5)+b=-7
f(-3)=a(-3)+b=9

Eliminasi=
5a+b=-7
-3a+b=9
______
8a=-16
a=-16/8
a=-2

5a+b=-7
-10+b=-7
b=-7+10
b=3

f(1)=a(1)+b=-2(1)+3=-2+3=1

Answer 2

F(x) = ax + b
f(5) --> a(5) + b = -7
5a + b = -7
f(-3) --> a(-3) + b = 9
-3a + b = 9

5a + b = -7
-3a + b = 9 -
8a = -16
a = -2

5a + b = -7
-10 + b = -7
b = 3

f(1) --> -2 × 1 + 3
= 1