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I'm unsure how to properly express how to do this to you but here is a list of steps on how to solve it. Good luck.
Answer:
When the graph has a horizontal line.
Step-by-step explanation:
Zero rate of change. When the value of increases, the value of remains constant. That is, there is no change in value and the graph is a horizontal line.
SOURCE: GOOGLE
Step-by-step explanation:
81 - 1.2x < 55
81 < 55 + 1.2x (add 1.2x to both sides)
1.2x > 26 (subtract 55 from both sides)
x > 21 2/3.
Answer:
B. {3/4,0}
Step-by-step explanation:

2y=4x +13
Y=2x +6.5
Answer y=2x + 6.5