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line GO THRU points
points: (-1,6) & (1,7)
deltax=2, deltay= 1
sloep=deltay/deltax=1/2 or 0.5
line formula...y=0.5x +konst
projekt line from x=-1 tu x=0...this deltax=1
deltay =slope*deltax=0.5*1=0.5
y=6 +0.5=6.5
point=(0,6.5)
y=0.5x +6.5