Question

o coeficiente angular da reta que passa pelos pontos A=(-1,2) e B= (3,6) É;

Answer 1

$\left[\begin{array}{ccc}x&y&1\\xa&ya&1\\xb&yb&1\end{array}\right] = \left[\begin{array}{ccc}x&y&1\\-1&2&1\\3&6&1\end{array}\right] =-4x+4y-12=-x-y-12\\\\-x-y-12=0\\-y=x+12\\y=-x-12\\\\\boxed{a=-1}$


Sabendo que :

$y=ax+b$

Onde :
a: coeficiente Angular
b:coeficiente Linear