This example illustrates why elimination works.

supply the missing reasons.

a) addition property of equality; substitution

b) associative property of addition; substitution

c) addition property of equality; commutative property of addition

d) associative property of addition; commutative property of addition

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.