standard_description: Use variables to represent two quantities in a real-world problem that change in relationship to one another; write an equation to express one quantity, thought of as the dependent variable, in terms of the other quantity, thought of as the independent variable. Analyze the relationship between the dependent and independent variables using graphs and tables, and relate these to the equation. For example, in a problem involving motion at constant speed, list and graph ordered pairs of distances and times, and write the equation d = 65t to represent the relationship between distance and time.
problem_activity: Task
Decide which of the following equations best represents each situation.
{"table": [{"tbody": [{"tr": [{"td": [{"_value": "$$x + 2= 10$$"}, {"_value": "$$x=10+2$$"}, {"_value": "$$2\\cdot10=x$$"}]}, {"td": [{"_value": "$$x+10=2$$"}, {"_value": "$$10x=2$$"}, {"_value": "$$2x=10$$"}]}]}]}]}
After Lou poured 2 liters of water into a large jug, the jug contained 10 liters of water. How many liters were in the jug to start?
Clara ran 10 miles, which was twice as far as Nina ran. How far did Nina run?


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