y=ax+b
0= -1/2 a + b
4= 3,5 a + b
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0= -1/2 a + b / *(-1)
0+4=0,5a +3,5a
4=4a
a=1
b=0,5
y=x+0,5
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0= -1/2 a + b / *(-1)
4= 3,5 a + b
0+4=0,5a +3,5a
4=4a
a=1
b=0,5
y=x+0,5