Question

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

Answer 1

Substitute everything in first


3(-2)-1-3(-2)


Then simplify


-6-1+6 = -1


The answer is -1

Answer 2

3 x (-2) - 1 - 3 x (-2)
(Simplify by: Multiplying a positive and a negitive equals a negative:
(+) x (-) = (+))
Multiplying two negitives equals a positive:
(-) x (-) = (+) )
-3 x 2 - 1 + 3 x 2
(Eliminate the opposites)
Answer: -1