Question

coeficiente angular =A(7,9) e B (2,9)

Answer 1

Coeficiente angular da reta que passa pelos pontos $A(x_{_{A}},\,y_{_{A}})$ e $B(x_{_{B}},\,y_{_{B}}):$

$m=\dfrac{\Delta y}{\Delta x}\\\\\\ m=\dfrac{y_{_B}-y_{_A}}{x_{_B}-x_{_A}}~~~~~~(\text{com }x_{_B}\ne x_{_A})$

_______________________

Então, para dos pontos dados

$A(7,\,9)~\text{ e }~B(2,\,9),$

o coeficiente angular é

$m=\dfrac{9-9}{2-7}\\\\\\m=\dfrac{0}{-5}\\\\\\ \boxed{\begin{array}{c}m=0 \end{array}}$


Bons estudos! :-)