3y+6=27

1. subtract six from six as well as 27 (this is called combining like terms)  this will give you 3y=21.  Then divide 3 into 3y as well as 27.  This will give you 9  or y=9

2. distribute 5 into (b-6) through multiplication.  This will give you 5b-6+7b=12. combine like terms 5b+7b.  This will give you 12b=12.  Now divide 12 from both sides.  This will give you 1  or b=1

3. Realize that the like terms are on opposite sides of the equals sign so you have to use the opposite signs.  Subtract the smaller number from the larger number...Start by subtracting 3x from itself as well as 11x.  This will give you 17=8x-13.  Now continue combining like terms and add 13 from itself as well as 17.  This will give you 30=8x.  Now divide 8 from 8x as well as 30.  this will give you 3.75=x.

4. First cross multiply.  1(8x+110)  and 5(10x+130)  This will give you 8x+110=40x+650.  Now combine like terms...remember to use the opposite sign because they are on different sides of the equals sign.  Subtract 8 from itself as well as 40x  This will give you 110=32x+650.  Now subtract 650 from itself as well as 110.  This will give you -540=32x.  Now divide 32 from itself as well as 540.  This will give you -16.875=x. 

Good