Is the equationy=-1/2 linear or nonlinear?

Afactory adds 3 red drops and 2 blue drops of coloring to white paint to make each pint of purple paint. the factory will make 50 gallons of the purple paint.how many drops of red and blue coloring will the factory need in the 50 gallon batch of purple paint.

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

In the diagram of circle o, what is the measure of zabc?