help please

Question

If 5x+8=10 for some value of x, then what is the value of 10x+16 for the same value of x? Please explain how you arrived at your answer.

Answer 1

If I understand correctly you just need to solve the first equation to find the value of x and then plug that value into the second equation.

 

5x+8=10

Subtract 8 from both sides

 

5x=2

Divide both sides by 5

 

x=(2/5)

 

Now plug that value into the second equation

 

10x+16=?

 

10(2/5)+16=?

 

4+16=20