Grace is 16 years old. mark is 5 years more than twice grace's age. how old is mark?

Can someone me and do the problem plz so i can understand it more better

Write an equation in slope intercept form of the line passes through the given point and is parallel to the graph of the given equation (0,0); y=3/8 x+2

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120