What is x + 4z - 5 - 3x, when x = 2 and z = 3x?

15

Step-by-step explanation:

Since we know x = 2 and z = 3x, let's find z by substituting the value for x into z:

z = 3 (2) = 6

Now that we have the values of both x and z, we can substitute them into the expression and simplify:

x + 4z - 5 - 3x

= 2 + 4 (6) - 5 - 3 (2)

= 2 + 24 - 5 - 6

= 15