f(x) = ax + b
f(2) = a.2 + b = 13
= 2a + b = 13
f(3) = a.3 + b = 15
= 3a + b = 15
3a + b = 15
2a + b = 13 -
a = 2
3.6 + b = 15
18 + b = 15
b = 15 - 18
b = -3
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f(x) = ax + b
f(2) = a.2 + b = 13
= 2a + b = 13
f(3) = a.3 + b = 15
= 3a + b = 15
3a + b = 15
2a + b = 13 -
a = 2
3a + b = 15
3.6 + b = 15
18 + b = 15
b = 15 - 18
b = -3
f(3)⇒3a+b = 15
mencari a :
∴ 2a+b=13 - 3a+b=15
∴ -a=-2
∴ a=2
mencari b :
∴ 2a+b = 13
∴ 2x2+b = 13
∴ 4+b = 13
∴ b = 13-4
∴ b = 9