Which system of equations has a solution of approximately (0.7,-1.4)?

"you know, playing tennis is healthier than watching a tennis match on television," katya remarked to her couch potato brother. in this sentence, healthier is a/an a. superlative. b. comparative. c. positive form. d. adverb.

I’m still confused on how to work the percentages

Change negative exponents to positive, then solve