Question

A reta que passa pelos pontos A(3,2) e B(1,4) é:
a) x+y+5=0
b) x-y-5=0
c) y=x+5
d) y=-x+5
e) x+y=-5

Answer 1

Resposta:

Alternativa d)

Explicação passo-a-passo:

$\displaystyle \left[\begin{array}{ccc}x&y&1\\3&2&1\\1&4&1\end{array}\right] =0\\\\\\\left[2.1-4.1\right]x-\left[3.1-1.1\right]y+3.4-1.2=0\\\left[2-4\right]x-\left[3-1\right]y+12-2=0\\-2x -2y + 10=0~(\div2)\\-x-y+5=0\\y=-x+5$