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A melhor resposta!
2014-07-23T18:29:39-03:00
Olá, Andyanymaniaca!

a)
f(x) = -3x + 2
-3x + 2 = 0
-3x = -2
x = -2/-3
x = 2/3

c)
f(x) = 2x + 10
2x + 10 = 0
2x = -10
x = -10/2
x = -5

e) y = -3x + 9
-3x + 9 = 0
-3x = -9
x = -9/-3
x = 3

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