How to find a slope of a line segment?

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. after tax the total is 45.99. what percentage of the subtotal is the total?

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.