Question

Evaluate the following expression using the values given:
Find 3x - y - 3z if x = -2, y = 1, and z = -2.
A.-13
B.-1
C.1
D.13

Answer 1

this is just a matter of subbing in your known values
3x - y - 3z when x = -2, y = 1, z = -2
so we sub
3(-2) - 1 - 3(-2)
-6 - 1 + 6 -- the 6's cancel leaving you with : 1 as your answer

Answer 2

understand ?

Answer 3

just remember that a negative times a negative is a positive and a negative times a positive is a negative.