Question

determine a função de 1 grau do gráfico abaixo:

Answer 1

$f(x) = ax + b\\\\f(1) = a + b = 0\\f(2) = 2a + b = -1\\\\a + b = 0 \Longrightarrow a = -b\\\\2a + b = -1\\2.(-b) + b = -1\\-2b + b = -1\\-b = -1\\b = 1\\\\a = -b\\a = -1\\\\f(x) = ax + b\\f(x) = -x + 1$