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3.
2(x-1)+x=x-3(2-3x)
2x-2+x=x-6+9x
3x-10x=-6+2
-7x=4 /:(-7)
x=-4/7
x <= 5
x >= -1
Ix - 2I <= 3
11.
y = 3x - 11
y = ax + b
Prosta równoległa ma taki sam współczynnik "a", tutaj: 3
y = 3x + b b E R
12.
2(x - 1) + x = x - 3(2 - 3x)
2(x - 1) = -3(2 - 3x)
2x - 2 = -6 + 9x
2x - 9x = -6 + 2
-7x = -4 /:(-7)
x = 4/7