Question

escreva a função afim f (x)=ax+b sabendo que f (1)=4 e f-2)=10

Answer 1

f(x)=ax+b
f(1)=4
f(1)=ax1+b
f(1)=a+b. f(1)=4
a+b=4

f(-2)=10
f(-2)=-2a+b
-2a+b=10

a+b=4 x(-1)
-2a+b=10

-a-b=-4
-2a+b=10

-3a=6
a=-2

a+b=4
-2+b=4
b=4+2
b=6

f(x)=-2x+6