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

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.