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-4y + 6 = -y + 18
-4y + y = 18 - 6
-3y = 12
y = -4
y ≥ -4
jadi, himpunan penyelesaiannya y = { -4, -3, -2, -1, 0.......}
3. 3(2y+4) = 2(y-4)
6y + 12 = 2y - 8
6y - 2y = -8 -12
4y = -20
y = -5
jadi, himpunan penyelesaiannya adalah y = 5