Solve by Substitution

-2x + y = -8
x - y = 5

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?

Create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1.

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?