X+y<7(-2,8)

how do i solve this with step by step instructions​

Asoccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

How do you use the elimination method for this question? explain, because i really want to understand!