Find the y-intercept of the line on the graph

The system of equations graphed below has how many solutions? y = 2x + 2

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

If 25% of y is 30, what is 60% of y?