Question

a esquaçao da reta que passa pelos pontos A (1.2) B (3.4) e . A) x-y+1=0 b) x+y-1=0 c)x-y-1=0 d) x+y+1=0

Answer 1

M=YB-YA/XB-XA
M=4-2/3-1
M=2/2
M=1

Y-Yo=M(X-Xo)
Y-2=1(X-1)
Y-2=X-1
X-1-Y+2=0
X-Y+1=0 

A)