What is the slope of the line through (1,? 1)(1,-1) (1,? 1) left parenthesis, 1, comma, minus, 1, right parenthesis and (5,? 7)(5,-7) (5,? 7) left parenthesis, 5, comma, minus, 7, right parenthesis ?

After reading 80% of her e-mails in her inbox, danette still has m unread e-mails. which of the following expressions could represent the number of e-mails danette had in her inbox before she started reading? choose 2 answers: (choice a) 5m (choice b) 1.8m (choice c) 80m (choice d) m/0.8 (choice e) m/1−0.8