Complete the point-slope equation of the line through (-2,6)(−2,6)left parenthesis, minus, 2, comma, 6, right parenthesis and (1,1)(1,1)left parenthesis, 1, comma, 1, right parenthesis. Use exact numbers.

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?