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a>0
2m-1>0
2m>1
m>0,5
b) y = 0 i x = -1
0 = -(2m-1) +3
2m - 1 = 3
2m = 4
m = 2
c) y = ax +b
proste są prostopadłe gdy a1=-1/a2
2m - 1 = - 1 /(1/5)
2m - 1 = -5
2m = -4
m = -2
d) x = -4 i y = -1
-1 = (2m -1)*(-4) +3
-4 = -8m +4
-8m = -8
m = 1