Question 170663
Evaluate: 

x = -4 , y = 6, z = -8 
2x+3y 
5xy-z 
-z+2x 

Replace x, y and z with their given values in each expression and simplify.

I will do one of them.

2x + 3y

Let x = -4 and Let y = 6

Then 2(-4) + 3(6) = -8 + 18 = 10

Can you do the rest now?
_______________________________ 


p-12= -15 
-11= -4+d 
-1.6k= -15 

Here, you need to solve each equation for the given variable.

I will do one of them.

p - 12 = -15

Add 12 to both sides.

p = 12 - 15

p = -3

Can you do the rest now?

I received your e-mail.

Here is the full reply:

Evaluate using: x = -4 , y = 6, z = -8 



2x+3y...Replace x with -4 and y with 6



2(-4) + 3(6) = -8 + 18 = 10



==================



5xy-z...5(-4) times (6) -(-8) = 5(-24) + 8 =  -120 + 8 = -112



==================




-z+2x...-(-8) + 2(-4) = 8 - 8 = 0



Did you follow?


_______________________________ 


When crossing the equal sign, change the sign infront of the numbers to the opposite ONLY when adding and subtracting.



p -12 = -15...We add 12 to both sides.



p = +12 - 15



p = -3



======================== 


-11= -4 + d...Here, we add 4 to both sides.



-11 + 4 = d



-7 = d



==================== 


-1.6k= -15....Here, we apply the division property or rule of algebra.  To find k, divide both sides by the coefficient of k, which is the decimal number -1.6 in this question.  



So, k = -15 divided by -1.6



Then, k =  9.375



Did you follow?