1.) Let's say that the circle on the graph below represents x. The arrow is pointing to all the numbers greater than x, which happens to be on -2. If it points right, this means that x can equal to any number greater than -2. So your answer is x > -2.
2.) For inequalities such as these, you can simplify just like what you do for normal equations. Let's isolate x.

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Answer:
Step-by-step explanation:
for the first equation x= -2 and y=-7
the second equation x=3 and y is 3 now just plot x and y from the same equation on the same line
He started out with 19.1 gallons because if you add 5.8 and 12.4 you get 19.1
Answer:
36 centimeters
Step-by-step explanation:
Since one side is 60 centimeters, just divide by 20 and get 3
Then multiply 12 by 3 and get 36
I hope this helps!