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f(x) = ax+b
f(5) = a(5)+b = 13
5a + b = 13...(1)
f(2) = a(2) +b = 4
2a + b = 4 ...(2)
5a + b = 13
2a + b = 4
----------------- - (eliminasi)
3a = 9
a = 3
2a + b = 4
2(3) +b =4
6 + b = 4
b = - 2
maka rumus fungsinya :
f(x) = ax+b
f(x) = 3x+ (-2)
f(x) = 3x -2
Cara ada di lampiran ya