If a =5b+3, find b when a =15

Question

Solve please I don’t inderstand 

Answer 1

Hi Ella,

 

Well, it's probably a different form than you are used to, but it is a substitution problem.  

a = 5b + 3    a= 15

15 = 5b + 3  does that look familiar?  You can switch sides if it makes it easier.

 

5b + 3 = 15   Subtract 3 from both sides.

5b = 12

 You can take it from here.  In general, if you can't see your way to the end, start with what you can do and see where it leads you.

Mary