Okay, you are welcome.

]]>I am hoping that you can formulate the problem. That is how to translate the words into mathematical statements.

Although I am of the type that is more interested in how then why, the ability to set the problem up is equally important.

]]>161 - 7b - 5b = 5

-7 - 5b = -156

-12b = -156

b = 13

thanks for link and help all (:

]]>Welcome to the forum.

I'll go through it line by line

a+b = 23

a = 23 - b **OK**

7a - 5b = 5

7 (23 - b) - 5b = 5 **OK**

151 - 7b - 5b = 5 **hhmmmm I make that 161 - 7b -5b = 5**

**So then it should be -12b = - 156 not ** -7b - 5b = 156

**Multiply both sides by -1**

12b = 156 **back on track here but would you have got this without knowing bobbym's answer?**

b = 13 **OK**

**So, some lines correct, but your mistakes sort of cancelled each other out. **

If you want more practice have a look at

http://www.mathsisfun.com/algebra/syste … tions.html

There's a long explanation of the methods you can use (which you could look at or skip if you feel confident, I think) but at the bottom there's a set of questions to try.

Bob

]]>a+b = 23

a = 23 - b

7a - 5b = 5

7 (23 - b) - 5b = 5

151 - 7b - 5b = 5

-7b - 5b = 156

12b = 156

b = 13

and second number easy but does that working make sense?

]]>any chance you can break down how you solve 7a - 5b = 5 ><

my book doesn't explain it

not being lazy i was able to do the earlier ones but just hit a wall here plzzzzzzzzzz tips and tricks

]]>7a - 5b = 5

The first number is 10 and the second number is 13.

Welcome to the forum.

]]>any advice much appreciated

The sum of two numbers is 23. Seven times the first number less five times the second number is equal to 5. What are the two numbers?

not sure where to start ><

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