Suatu fungsi f dirumuskan f(x) = ax + b. Jika f(3) = 13 dan f(-1) = -11, nilai dari 2a+b adalah

F(x) = ax + b
F(3) = 3a + b = 13
F(-1) = -1a + b = -11
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4a = 24
a = 24 ÷ 4
a = 6

a = 6 ㅡ> 3a + b = 13
3(6) + b = 13
18 + b = 13
b = 13 - 18
b = -5

2a + b
2(6) + (-5)
12 + (-5)
= 7