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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

Could somebody me with this radical simplification?

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form