7) Select the best method to solve the system. 3x+y=7
2x=3y-4

*elimination
*substitution

(40 points) i need some . an answer definition is appreciated as well.

Find │–14│ a. 14 b. –14 c. start fraction 1 over 14 end fraction

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {