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2a- 1 < 0
2a < 1
a< 1/2
b) f(x) = a1x + b
g(x) = a2x + b prostopadłe <=> a1= - (1/a2)
2a - 1 = -(1/ 2/3 ) = -3/2
2a = -1/2
a = -1/4