Answer:
C. y=x+7
Step-by-step explanation:
If you add 7 to the values on the left, you'll get the values on the right.
 
        
                    
             
        
        
        
Answer:
-xy+5x2(power of x is 2)y
Step-by-step explanation:
-xy+5x2y
 
        
             
        
        
        
Answer:
$7
Step-by-step explanation:
To solve this one we will subtract how much he spends from what he has.  At the start he had 19 and then spent 8 meaning he now has 8 less than when we started so 19-8 is 11.  He now as 11 dollars, then he spend another 4 meaning we have to subtract another 4 dollars.  11-4 is 7.  So he as 7 dollars left at the end.
I hope this helps and please don't hesitate to ask if there is anything still unclear!
 
        
                    
             
        
        
        
Answer:
The line crosses the x-axis at the point (-3.5,0).
 
        
             
        
        
        
We're going to solve each of the systems to determine the solution.
<u>System  </u>
</u>

using a graph tool
the solution is the line 
see the attached figure N 
<u>System  </u>
</u>

using a graph tool
the solution is the shaded area
see the attached figure N 
<u>System  </u>
</u>

using a graph tool
The system has no solution
see the attached figure N 
<u>System  </u>
</u>

using a graph tool
the solution is the shaded area
see the attached figure N 
therefore
<u>the answer is</u>
<u>System  </u>
</u>
