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2.
-4 = -1*a + b
-3 = 0*a + b
b = -3
-a - 3 = -4
b = -3
a = 1
y = x - 3
3. rownolegle gdy:
a1 = a2
a1 = -3 = a2
y = -3x + b
3 = -3*(-2)+b
b = -3
y = -3x - 3