1. if to suppose the price of the apples is 'a' and the price of the grapes is 'g', then on the first day was earned 24*a+16*g=72.8 (1-equation) and on the second day 30*a+25*g=100.25 (2-equation);
2. if to solve these two equations as the the system of equations, then a=1.8 euro/kg and g=1.85 euro/kg
The answer your looking for is (0,64) because your asking what is the vertex form. If you need any other help with any questions let me know and I'lll be happy to help you
