Question 167321
A.  slope = change in y/change in x   m=4-4/2+3=0

    so y-4=(0)(x-2)  y=4 or {{{highlight(0x+1y=4)}}}

B. using point slope form:y-6=-3(x-4)---> y-6=-3x+12--->{{{highlight(3x+y=18)}}}
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C. slope (0-4)/(-1-0)=4--> y-4=4(x-0)---> y-4=4x--->{{{highlight(4x+y=4)}}}
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D.x=-4 is a horizontal line where x=-4 for any y value
   a line parallel to this through (-9,0) will also be a horizontal line where x
   = -9 for all y values. and would be written as {{{highlight(x=-9)}}}