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(=) a + b = 5
f(-1) = 1
(=) -a + b = 1
a + b = 5
-a + b = 1_-
2a = 4
a = 2
a + b = 5
2 + b = 5
b = 3
f(x) = 2x + 3
a+b=5 -a+b =1
a+b=5
-a+b=1 _
2a=4
a=2
-a+b=1
-2+b=1
b=3
rumus fungsinya
=ax+b
2(x)+3
2x+3
Jadi rumus fungsinya adalah b.2x+3
Insyaallah bermanfaat