Question

Suatu fungsi f dinyatakan oleh f(x)= ax+b. Diketahui f (-3)= 11 dan f(1)=3. Nilai a+b= .....

Answer 1

F(x) = ax + b


f(1) = a + b = 3


a + b = 3

Answer 2

F(x) = ax + b

f(-3) = 11
-3a + b = 11

f(1) = 3
a + b = 3

jawabannya 3

bukti :
b = 3 - a

-3a + b = 11
-3a + (3 - a) = 11
-3a + 3 - a = 11
-3a - a = 11 - 3
-4a = 8
a = -2

-3a + b = 11
-3(-2) + b = 11
6 + b = 11
b = 5

a + b = 3
-2 + 5 = 3
3 = 3
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