18. Purchasing an item now and agreeing to pay for it in a series of future payments is known as a/an . *

Installment purchases are a type of payment system that allows you to pay for an item over time. This quiz/worksheet combo will help ensure you understand the math necessary to calculate an item's total cost.

Step-by-step explanation:

hope it will help you mark brainlist please

b. would be the answer : )

step-by-step explanation:

step 1: add -16x to both sides.

16x−4y+−16x=64+−16x  

−4y=−16x+64

step 2: divide both sides by -4.

−4y /-4 = -16x + 64/-4

answer:   y=4x−16

hope i'm right