There are lots of tall buildings in New York.(对划线部分提问)
已知x、y满足约束条件{5x+3y≤15x-y+1≥0x-5y≤3,则z=3x+5y的最小值为( )
吾尝终日而思矣,____;____,不如登高之博见也。 《荀子·劝学》)