What is x plus 4z-5-3x then x equals 2 and z equals 3x?

Answer 1

If the question is

x + 4z - 5 - 3x when x = 2 and z = 3x, then

First simplify the original statement

x + 4z - 5 - 3x = 4z - 5 - 2x

Secondly substitute in 3x for z

4z - 5 - 2x = 4*3x - 5 - 2x

= 12x - 5 - 2x

= 10x - 5

Lastly substitute 2 for the x

10x - 5 = 10*2 - 5

= 20 - 5

= 15

or

x + 4z - 5 - 3x when x = 2 and z = 3x, so z = 3*2 = 6

x + 4z - 5 - 3x

= 4z - 5 - 2x (replace the variables with the corresponding values)

= 4*6 - 5 - 2*2

= 24 - 5 - 4

= 24 - 9

= 15