Explanation:
ax+by+c=0 is the equation of a line
using y-y1=m(x-x1)
m=3+1/5+4=4/9
y+1=4/9(x+4) multiplying through 9
9y+9=4(x+4)
9y+9=4x+16
9y+9-4x-16=0
9y-7-4x=0
9y-4x-7=0
then you have your answer
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