Question

Fie functia f:R--R,f(x)=ax+b,und a si b sunt nr reale pt care f(-1)=-5 si f(0)=-2.aratati ca f(1)=1

Answer 1

f(-1)=-5⇒-a+b=-5⇒a-b=5 
f(0)=-2⇒  b=-2
a+2=5, a=3
f(x)=3x-2
f(1)=3x1-2=1

Answer 2

f(x) = ax + b
-a + b = 5
b = 2
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f(1) = 1 ?
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-a + 2 = 5 => a = -3
f(x) = 2 -3x
f(1) = 2 -3 = -1