Question 152221
1. 3(x+1)< 18 
Answer:
3x+3<18
3x<15
x<15/3=5
Set of solutions: S={x/x<5}
2. x+7- 8x -9> 3(x-7)
Answer:
-7x-2>3x-21
-10x>-19
10x<19
x<1.9
Set of solutions: S={x/x<1.9}
 
3. Whats the different between Linear equation and Linear inequalities


equations always have an = sign
example: x+3=5 (solution is x=2)
Inequalities always have an < or > or <= or >=
and if exists a solution is a set of numbers
example:  solve x+3<5
x<2 solution set is S={x/x<2}