Plz help me it’s a little difficult

Ineed asap graph the system of equations 2x+y=5; 14+7y=35

Solve each quadratic equation by factoring and using the zero product property. 14x - 49 = x^2

The number of 8th graders who responded to a poll of 6th grade and 8 th graders was one fourtg of the number of 6th graders whi responded if a total of 100 students responddd to the poll how many of the students responded were 6 th graders