Diketahui rumus fungsi f(x)=ax+b. jika f(5) = 13 dan f(3) = 7, tentukan rumus fungsinya

f (5) = 5a + b = 13
f (3) = 3a + b = 7 —
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<====> 2a = 6
<====> a = 3

9 + b = 7
b = 7 - 9
b = -2

Rumus fungsi f (x) = 3x - 2


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