Simplify the algebraic expression

Question

3xz + 4xy – 2yz + xy + 5yz – 9xz
and evaluate it for x = 3, y = -2, z = -5.
Identify the variables, constants, and coefficients in the simplified expression.

Answer 1

simplified (just a bit)
x(5y-6z) + 3yz

3(-10+30) + 3(-2)(-5) = 90

Answer 2

4xy+5yz-9xz-4xy