Describe a real-word situation that can be modeled by the equation y=1/20x. be sure to describe what each variable represents

Use the distance formula to determine the distance that point q is from r on the hypotenusebased on a 2-3 ratio.i need asap !

Solve the system of equations y= 3/2 - 1, -x+ y =-3

Satchi found a used bookstore that sells pre-owned dvds and cds. dvds cost $9 each, and cds cost $7 each. satchi can spend no more than $45.