(-16,-12) & (19,-7) look like 2 points
me assume yu want strate line tween em
deltax=16+19=35, deltay=-7-12=5
slope=deltay/deltax=5/35=1/7 or 0.142857142857142857...
line: y=(1/7)x+konst
projekt line from x=-16 tu x=0...deltax=16, deltay=slope*deltax=(1/7)*16=16/7
deltay=2.285714285714...
y at x=0...-12+2.28571428571428
=-9.7142857142857...
line: y=(1/7)x-9.7142857142857...