Select the correct answer. What is the value of x in this linear system?
2x + 8y – z = -9
y + z = 7
-x– y + z = 8
A.0
B.-7
C.7
D.-1

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?

If 7x=9y, y/z = 7/5 , then x/z = (a) 2/7 (b) 7/9 (c) 9/5 (d) 9/7 (e) 5/9