Question

3. Faça os gráficos das seguintes funções:
a. f(x) = 6x - 2, onde a = 6 e b= -2;
b. f(x) = -5x + 4, onde a = -5 e b= 4;
Obs: Faça um gráfico para cada função​

Answer 1

$\boxed{\begin{array}{l}\tt a)~\\\underline{\rm intersecc_{\!\!,}\tilde ao~com~o~eixo~x:} \\\sf y=0\\\sf 6x-2=0\\\sf 6x=2\\\sf x=\dfrac{2}{6}\\\sf x=\dfrac{1}{3}\implies~A\bigg(\dfrac{1}{3},0\bigg) \\\underline{\rm intersecc_{\!\!,}\tilde ao~com~eixo~y:}\\\sf f(0)=6\cdot(0)-2=-2\implies B(0,-2)\end{array}}$

$\boxed{\begin{array}{l}\tt b)~\\\underline{\rm intersecc_{\!\!,}\tilde ao~com~o~eixo~x:} \\\sf y=0\\\sf -5x+4=0\\\sf 5x=4\\\sf x=\dfrac{4}{5}\implies~A\bigg(\dfrac{4}{5},0\bigg) \\\underline{\rm intersecc_{\!\!,}\tilde ao~com~eixo~y:}\\\sf f(0)=-5\cdot(0)+4=4\implies B(0,4)\end{array}}$