The father is 60 years old and his son is half his age. how old was the boy when his father was 4 times his age?

Then 30-20= 10 yrs. old, the boys age when his dad was 40 years old

choice b is correct

step-by-step explanation:

we have been given the following system of inequalities;

we are required to graph the solution to the system of inequalities. using a graphing tool, the graph of the system is as shown in the attachment. the continuous line represents the graph of while the dotted line represents .