Tolong di jawab ya no 17 sama 18

x1=3, x2= -1   y1= 2, y2= -6
rumus:
x-x1/x2-x1 = y-y1/y2-y1
= x-3/-1-3= y-2/-6-2
=x-3/-4= y-2/-8      (kali silang)
=-8(x-3)= -4(y-2)
=-8x+24=-4y+8     pindah ruas
=-8x+4y=8-24
= -8x+4y= -16        dibagi 4
= -2x+y= -4
JAWABAN: B