Find 3x - y - 3z if x = -2, y = 1, and z = -2.

Question

hero · Answer

You're just checking your answers, right?

anonymous · Answer

Sometimes. Some of them I don't really know

hero · Answer

In this one, you simply replace the values of x, y, and z into the expression: 

Since x = -2, y = 1, and z = -2, replace all of those values into the given expression: 
3(-2) - (1) - 3(-2) 

(-6) - (1) -(-6)
-6 - 1 + 6
6 - 6 - 1
0 - 1
1

So the expression 3x - y - 3z = 1

anonymous · Answer

So, it is basically the matter of doing the keep it, flip it, switch it, or change the sign add a line problem.

hero · Answer

It's just what's called order of operations and properties of addition and multiplication

anonymous · Answer

alright. I got it now

hero · Answer

PEMDAS and Associative property mainly