#1

#3**0 **

there's 2 ways to solve this.

1. you can just experiment, and you can see that a=0, b=2, and c=7

2. we see that **a+b+a+c=b+c**

**2a+b+c=b+c**

**2a=0**

**a=0**

from there, you can find the other values :)

lokiisnotdead
Jul 1, 2020

#2**+1 **

a+b=2

a+c=7

b+c=9

Add all three equations together to get 2a+2b+2c=18. We divide this equation by 2 to get a+b+c=**9.**

gwenspooner85 Jul 1, 2020