diket f(x) = ax+b. f(1)= -2. dan f(4) = 19. Tentukan rumus fungsi f(x). b. tentukan nilai f(-4).

f (x) =ax + b
f (1) = 1a + b = -2
f (4) = 4a  + b = 19

4a + b =19
a + b = -2

3a = 21

a = 7

a + b = -2
7 + b = -2
b = -2 - 7

b = -9

f (-4) = -4a + b
f (-4) = -4.7 + -9
f (-4) = -28 - 9
f (-4) = -37

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