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y=ax+b
2=-3a+b
-b=-3a-2
b=3a+2
y=ax+b
y (0,-1)
-1=b
podstawiam:
b=3a+2
-1=3a+2
-3a=2+1
-3a=3//:(-3)
a=-1
a=-1
b=-1
y=ax+b
podstawiam a i b
y=-x-1
y = ax + b
2 =-3a + b
-b =-3a - 2
b =3 a + 2
y = ax + b
y (0,-1)
-1 = b
podstawiam:
b = 3a + 2
-1 = 3a + 2
-3a = 2 + 1
-3a = 3 /: (-3)
a = -1
a = -1
b = -1
y = ax + b
podstawiam a i b
y = -x - 1