Question

P.85 calcule os coeficientes angulares das retas :
A) x-y=0
B) 3y-1=0
C)5x+1=0
D)2y+5=0​

Answer 1

$\Large\boxed{\begin{array}{l}\underline{\rm Coeficiente~angular~a~partir}\\\underline{\rm da~equac_{\!\!,}\tilde ao~geral~da~reta}\\\sf Dada~a~reta~r:~ax+by+c=0\\\sf o~coeficiente~angular~\acute e~dado~por\\\sf m=-\dfrac{a}{b}\end{array}}$

$\Large\boxed{\begin{array}{l}\tt a)~\sf x-y=0\\\sf m=-\dfrac{1}{-1}=1\\\\\tt b)~\sf 3y-1=0\\\sf m=-\dfrac{0}{3}=0\\\\\tt c)~\sf 5x+1=0\\\sf m\not~\exists~pois~ b=0\\\sf e~divis\tilde ao~por~0~n\tilde ao~existe\\\\\tt d)~\sf2y+5=0\\\sf m=-\dfrac{0}{2}=0\end{array}}$