This is the answer if you mean 719-26 
700-30= 670
        
                    
             
        
        
        

Let's multiply the first equation by 3. (As you can see y's coefficient in the first one is 1 and in the second one is -3 , we will multiply the first equation by 3 so when we add the equations their sum will be 0)

Now let's add this new equation and our second equation.

We found x=-3
Now let's plug x's value in one of the equations to find y's value.

So we found y=5
Solution ;
(-3, 5)
 
        
             
        
        
        
Step-by-step explanation:
the sequence is arithmetic due to the common difference that is equal 
d=11-15=7-11=-4
  a(n) = a1 +(n-1)d
a1=15
Then :
a(n) = 15+(n-1)-4
hope this helps
 
        
             
        
        
        
Hello!
7 out of 11 people brought an umbrella to the beach
this is a fraction of 7/11
We multiply this by 99 to get how many people brought an umbrella out of 99
7/11 * 99 = 63
You subtract this from 99 to see how many did not have an umbrella
99 - 63 = 36
The answer is 36 people
Hope this helps!