Question

Dada a função y = 19 - 8x, calcule o valor de x quando:

f(x) = 0 b) f(x) = -19 c) y = ⅜ d) y = -8 e) f(x) = -1

Answer 1

Resposta:

a0 f(x) = 0    ==>y=19-8*0 =19

b) f(x) = -19  ==>19-8x=-19  ==>x=-38/8=-19/4

c) y = ⅜   ==> 19-8x=3/8 ==> 8x= 19-3/8  ==>8x=149/8 ==>x=149/64

d) y = -8 ==> 19-8x=-8 ==> 8x=27  ==>x=27/8

e) f(x) = -1  ==>19-8x=-1 ==>8x=20 ==>x=20/8=5/2