2x-7y=18 _(1)
-2x+4y=5
11y=23 , Y=23/11 sub in 1
2x-7×23/11=18
2x = 18×11 + 7×23
x = ( 198 + 161 )/2 = 359/2
        
             
        
        
        
Answer:
0.56 
it's basically the number closest to 50. Don't get tricked by the 0.05 because that's only 5% not 50%
 
        
             
        
        
        
Answer:
(a) Verified
(b) They are simultaneous equations
Step-by-step explanation:
Given


Required
Verify that:  is a solution
 is a solution
We have:

Substitute:  
 

Evaluate all products

Subtract:

<em>Because both sides of the equation are equal, then the point is a solution</em>
<em></em>
Also: 
Substitute:  
 

Evaluate all products

Subtract:

<em>Because both sides of the equation are equal, then the point is a solution</em>
<em></em>
<em></em>
Because the given point is a solution to both equations, then they are simultaneous equation
 
        
             
        
        
        
The general form of the geometric sequence is 

, where a sub n is the number term you're looking for (we're looking for the tenth term). a sub 1 is the first term in the sequence (ours is -6), r is the common ratio, and n-1 is the numbered term you're looking for minus 1.  Our formula then looks like this: 

.  Simplify it to  

.  Take 2 to the 9th power then multiply it by -6 to get -3072.  C is your answer.
 
        
        
        
A. x-12=15 x = 27
b. x+x+1+x+2 = 234 3x = 231 x=77 so the numbers are 77,78,79