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4=-2a+b
0=4a+b
b=4+2a
b=-4a
4+2a=-4a
6a=-4
a=-2/3
b=-4/a=8/3
Odp: y=-2/3x+8/3
Sx=(-2+4)/2=1
Sy=(4+0)/2=2
S(1;2)
y=3/2x+b
2=3/2*1+b
b=1/2
Odp: y=3/2x+1/2
b) 2=-a+b
4=5a+b
b=2+a
b=4-5a
2+a=4-5a
6a=2
a=1/3
b=4-5/3=7/3
Odp: y=1/3x+7/3
Sx=(-1+5)/2=2
Sy=(2+4)/2=3
S(2;3)
y=-3x+b
3=-3*2+b
3=-6+b
b=9
Odp: y=-3x+9