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y=ax+b
3=3a+b
-4=-4a+b odejmujemy stronami
7=7a
a=1
3=3+b
b=0
y=x
c(0,0)
0=0
TAK
b)
A=(-2,-7) B=(1,-4) C=(1000,1005)
-7=-2a+b
-4=a+b odejmujemy stronami
-3=-3a
a=1
-7=-2+b
b=-5
y=x-5
1005=1000-5
1005=995
NIE