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f(x)=ax+b
jawab:
f(2)=1 → a(2)+b=1
→ 2a+b=1
→ b= 1-2a
f(4)=7 → a(4)+1-2a=7
→ 4a-2a+1=7
→ 2a+1=7
→ 2a=7-1
→ 2a=6
→ a=6/2
→ a=3
lalu kita masukkan nilai a ke pers b.
b=1-2a
b=1-2(3)
b=1-6
b=-5
jadi,nilai a+2b
= 3+2(-5)
= 3-10
= -7
#maaf kalo salah ya...!!!