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-4=a+b
-2=-a+b
2b=-6
b=-3
-4=a-3
a=-1
y=-x-3
2a]
y=-x+3
a1=-1 a1*a2=-1 a2=1
y=x+b
4=-1+b
b=5
y=x+5
b]
y=-4x a=-4
y=-4x+b
4=-1*(-4)+b
b=4-4=0
y=-4x
3]
I AB I=√[(6+2)²+(5+4)²]=√145
x=[6-2]/2=2 y=[5-4]/2=1/2
S=(2,1/2)
4]
a]
x²+y²=49
b]
(x+1)²+(y-2)²=6
5a]
S=(0,0) r=√10
b]
S=(5,-9) r=√64=8