Verona is an artist in Marfa, Texas, who paints the Marfa lights over a field. She prints postcards of her paintings to sell to tourists. The cost to print postcards is a
flat $60 fee plus $0.25 per postcard. She sells the postcards for $1.25 each. Write an
equation that represents Verona's costs and an equation that represents her
earnings on sales. How many postcards must she sell before she starts making
a profit?