jika diketahu f(2)=1 f(4)=2 maka berapa f(x)? tolong dibantu cepat yaaa

f( x ) = ax + b
f( 2) = 2a + b = 1
f(4 ) = 4a +b = 2 -
-2a = -1
a= 1/2
2( 1/2) + b = 1
1+ b = 1
b = 1-1
b = 0

f(x) = 1/2x + 0
# semoga jawabannya sesuai ,maaf klu salah.