x<=4
x is less than or equal to four
children less than or equal to four can ride the train for free
Step-by-step explanation:

The answer is SR=3
2x+23+x+21=14
Solve for x you get
x=-10
Substitute x
2(-10)+23=3
Answer:
I believe the slope is 1
Step-by-step explanation:
The integers are called the opposites because they are on the opposite side of zero.