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a)
2a+b=0
-2a+b=6
2a-2a+b+b=0+6
2b=6 /:2
b=3
2a+3=0
2a=-3 /:2
a=-3/2
więc:
y=-3/2 x + 3
b)
-2a+b=0
b=6
-2a+6=0
-2a=-6 /:(-2)
a=3
więc:
y=3x+6
wzór (x2-x1)(y-y1)=(y2-y1)(x-x1)
(-2-2)(y-0)=(6-0)(x-2)
-4(y-0)=6(x-2)
-4y=6x-12 / :-4
y=-6/4x+3 y=-3/2x+3
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b) A=(-2,0) B=(0,6)
tak samo w/g wzoru wyżej
(0+2)(y-0)=(6-0)(x+2)
2y=6(x+2)
2y=6x+12 / :2
y=3x+6