Question

If x = 3z + 4 ; y = x - 4 and z = 1.5 . find the value of 2x + 3y - 2z

Answer 1

Answer:

27.5

Step-by-step explanation:

Since z = 1.5, we have

x = 3z + 4 = ( 3 x 1.5 ) + 4 = 4.5 + 4 = 8.5

and then

y = x - 4 = 8.5 - 4 = 4.5.

Putting these values into the required expression, we get

2x + 3y - 2z

= (2)(8.5) + (3)(4.5) - (2)(1.5)

= 17 + 13.5 - 3

= 27.5

Answer 2

Answer:

Step-by-step explanation:

2x + 3y - 2z = 2(3z + 4) + 3(3z) - 2z =

= 6z + 8 + 9z - 2z

= 13z + 8 =

= 13 * 1.5 + 8

= 19.5 + 8

= 27.5