Answer:
Given the system of equation: 
 ......[1]
                    ......[1]
 ......[2]
                      ......[2]
we can rewrite equation [2] as;
 ......[3]
                ......[3]
Substitute equation [3] into [1] to eliminate x, and solve for y;

Using distributive property: 

Combine like terms;
16 - 8y = -4
Add 4 to both sides we have;
20 - 8y = 0
Add 8y to both sides we have;
20 = 8y 
Divide 8 to both sides we have;

Substitute the y-value in [3] we have;

x = 8 - 5 = 3
Therefore, the  expression should be substituted into the first equation is,  and also the value of x = 3 and y = 2.5
  and also the value of x = 3 and y = 2.5
 
        
                    
             
        
        
        
Answer:
<h2>[a]=x²_6x</h2><h2>[b]=4x²+x</h2><h2>[c]=10x²+8x</h2><h2>[d]15x²_3xy</h2>
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
y = -x+3
Step-by-step explanation:
We have two points so we can find the slope
m =(y2-y1)/(x2-x1)
     (1-2)/(2-1)
     -1/1
  The slope is -1
We can use the slope intercept form of the equation
y = mx+b where m is the slope and b is the y intercept
y = -x+b
Substitute a point into the equation to find b
2 = -1 +b
Add 1 to each side
2+1 =-1+1 +b
3 =b
y = -x+3
 
        
             
        
        
        
(5-3)^2 is = -4 , the second one is -9.67
        
             
        
        
        
Here, 3x + 2y = 12
2x + 2y = 10
Subtract 2nd from 1st equation, 
x = 2
Now, substitute in 2nd, 
2(2) + 2y = 10
2y = 10 - 4
y = 6/2
y = 3
In short, Your Answer would be: (2, 3)
Hope this helps!