Question

1.Simplify the following expression
x - 4y + 2z - 3x - 3y + 2z = ?.



2.Evaluate the following expression using the values given:
Find 4x - y - 2z if x = -2, y = 3, and z = -2

Answer 1

x - 4y + 2z - 3x - 3y + 2z --- lets put our like terms together
x - 3x = -2x
-4y - 3y = -7y
2z + 2z = 4z
now put it all together and you get : -2x - 7y + 4z
======================
4x - y - 2z ....when x = -2, y = 3 and z = -2
time to sub
4(-2) - 3 - 2(-2)
-8 - 3 + 4 =
- 7
===========
any questions ?

Answer 2

when you said put it all together and you get -2x - 7y + 4z wouldn't it be 2z + 2z = 4z ?

Answer 3

-2x + 7y + 4z
-2x -7y + 4z
-3x + 7y + 4z
-3y - 7z + 4z