Question

Evaluate each expression for x=4, y=-2 and z=5. show all work : 1. 2y +4x 2. -2x+6z 3. z(x+y) 4. 2x + 3y + 4z

Answer 1

1. 12

2. 22

3. 10

4. 22

Step-by-step explanation:

When x=4, y=-2 and z=5

(1)2y +4x

`\begin{gathered} 2y+4x=2(-2)+4(4) \\ =-4+16 \\ =12 \end{gathered}`

(2) -2x+6z

`\begin{gathered} -2x+6z=-2(4)+6(5) \\ =-8+30 \\ =22 \end{gathered}`

(3)z(x+y)

`\begin{gathered} z\mleft(x+y\mright)=5(4+(-2)) \\ =5(4-2) \\ =5*2 \\ =10 \end{gathered}`

(4)2x + 3y + 4z​

`\begin{gathered} 2x+3y+4z​=2(4)+3(-2)+4(5) \\ =8-6+20 \\ =8+20-6 \\ =28-6 \\ =22 \end{gathered}`