Determine which three out of the six points shown below are a solutio equation 3x +y= 21. Plot the three points that are in the solutions
through the three points and then answer the questions below.
(5, -6)(7,0), (9,6), (4,9), (6,3), (2,3)

What is the value of x when x + 7 = 21?

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label?

What is the domain of the step function f(x)=[2x]-1?