To solve the system of equations below, maria isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 3y=12x {x^2+y=18 a. x^2 + x = 18 b. x^2 − 4x = 18 c. x^2 + 4 = 18 d. x^2 + 4x = 18

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2