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5=-7a+b
-1=-4a+b
b=5+7a
-1=-4a+5+7a
3a=-6
a=-2
b=-9
y=-2x-9
b) A=(-2,6) B=(0,0)
6=-2a+b
0=0a+b
b=0
-2a=6
a=-3
y=-3x
5=-7a+b
-1=-4a+b
b=5+7a
-1=-4a+5+7a
3a=-6
a=-2
b=-9
y=-2x-9
b) A=(-2,6) B=(0,0)
6=-2a+b
0=0a+b
b=0
-2a=6
a=-3
y=-3x
x2=-4 x1=-7 y1=5 y2=-1
(-4+7)(y-5)=(-1-5)(x+7)
3y-15=-6x-42
3y=-6x-27 /3
y=-2x-9
b)
x1=-2 x2=0 y1=6 y2=0
(0+2)(y-6)=(0-6)(x+2)
2y-12=-6x-12
2y=-6x /2
y=-3x