T/7=3 what’s the answer?

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

What is the quadric regression equation that fits these data

Brainliest ! which of the coordinates are not of th vertices of the feasible region for the system of inequalities y≤4,,x≤5,x+y> 6 a(2,4) b(0,6) c(5,4) d(5,1)