Znajdź równanie prostej przechodzącej przez punkty :
a) A= (1,-3), B=(0,4)
b) A= (20,1 ), B = (0,10 )
a) a=4-(-3)/0-1=7/-1=-7
y=-7x+b
-3=-7*1+b
-3=-7+b
-b=3-7
-b=-4/:(-1)
b=4
y=7x+4
b)a=10-1/0-20=9/-20=-9/20
y=-9/20x+b
1=-9/20:20+b
1=-9+b
-b=-1-9
-b=-10/:(-1)
b=10
y=-9/20x+10
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a) a=4-(-3)/0-1=7/-1=-7
y=-7x+b
-3=-7*1+b
-3=-7+b
-b=3-7
-b=-4/:(-1)
b=4
y=7x+4
b)a=10-1/0-20=9/-20=-9/20
y=-9/20x+b
1=-9/20:20+b
1=-9+b
-b=-1-9
-b=-10/:(-1)
b=10
y=-9/20x+10