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A=(4,1)
d=|3*4-4*1+2|/√3²+4²=10/√25=10/5=2
B=(0,2)
d=|3*0-4*2+2|/5=|-6|/5=6/5
C=(2,2)
d=(3*2-4*2+2|/5=0/5=0
2)
y=-x+3
x+y-3=0
A=(2,0)
d=|2+0-3|/√1+1=|-1|/√2=1/√2=√2/2
B=(3,-2)
d=|3-2-3|/√2=2/√2=2√2/2=√2
C=(-3,-7)
d=|-3-7-3|/√2=13/√2=13√2/2