Marvin bought some softballs and hardballs for the high school teams he coaches. Softballs cost $5 each, and hardballs cost $4 each. Marvin can spend no more than $20. If \displaystyle xx represents the number of hardballs be bought, and \displaystyle yy represents the number of softballs he bought, then write an equation in standard form, \displaystyle Ax+By=CAx+By=C that represents this situation. Don't use \displaystyle == . Use inequality symbols instead.