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1. y=-x+5 --> dla x=-2 y=7, dla x=-1 y=6, dla x=0 y=5, dla x=1 y=4, dla x=2 y=3
2. y=x-5 --> x=-2 y=-7, dla x=-1 y=-6, dla x=0 y=-5, dla x=1 y=-4
dla x=2 y=-3
Pole trojkata= 1/2 *a*h = 1/2*10*5=5*5=25j kwadratowych