write an equation for the line, in point-slope form, that passes through the following points. (6,-7) (-1, 1)

Ineed to know the answer to this algebra question.

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. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"