Question

O valor de A para o coeficiente angular da reta que passa pelos pontos A(a,1) e B(5,a) seja -2

Answer 1

$Resolu\c{c}\~ao \to \left\{\begin{array}{ccc}m = \frac{\Delta y}{\Delta x}\\\\-2 = \frac{(a-1)}{(5-a)\\\\-2*(5-a) = (a-1)}\\\\-10+2a = a-1\\\\2a-a = -1+10\\\\\boxed{\boxed{a = 9}}\end{array}\right$

Espero ter ajudado. =^.^=