Question

70 books and 30 pens cost rupees 2100. write a linear equation and draw its graph

Answer 1

I cannot draw its graph but the equation is 
70b+30p=2100
when b is for books and p is for pens

Answer 2

70 books and 30 pens cost rupees 2100.write a linear equation in two variables to represent this statement and draw its graph.