Your answer is B) 140 + 6x = 462 - 10x
140 + 6x represents Katherine's bank, and 462 - 10x represents Abbie's bank.
140 + 6x; Katherine starts with 140 and saves 6 dollars per week, so x is the number of weeks and 6 represents the 6 dollars saved.
462 - 10x; Abbie starts with 462 and spends 10 dollars per week, x is the number of weeks, 10 represents the 10 dollars spent, and the subtraction sign shows that she is losing the money.