Answer:
Step-by-step explanation:
<u><em>8).</em></u>   
 
<em>(2)</em> × [ - 3 ] 
4x + 3y = 1 ........ <em>(3)</em> 
- 3x - 3y = - 6 .... <em>(4)</em> 
<em>(3)</em> + <em>(4)</em> 
x = - 5 
- 5 + y = 2 ⇒ y = 7 
<em>( - 5 , 7 )</em> 
<u><em>9).</em></u>  
 
<em>(1)</em> ÷ [- 3] 
3x - y = - 6  ......... <em>(3)</em>
2x + y = - 4 ........ <em>(4)</em> 
<em>(3)</em> + <em>(4)</em> 
5x = - 10 ⇒ x = - 2 
2(- 2) + y = - 4 ⇒ y = 0 
<em>(- 2, 0)</em> 
<u><em>10).</em></u>  
 
<em>(2)</em> ÷ 10 
x - 0.6y = 0 ⇒ x = 0.6y -----> <em>(1)</em> 
0.6y - 2y = 14 
- 1.4y = 14 
y = - 10 
x - 2(- 10) = 14 ⇒ x = - 6 
<em>(- 6, - 10)</em> 
Now is your turn, you can do it!! 
 
        
             
        
        
        
Answer:
B,C and B,A
Step-by-step explanation:
Line the cordients and go up right,Then left to find your answer.
 
        
             
        
        
        
So first you do 3,816 divided by 12 , because you need to find how much for 1 so then you can find out 25% off of 1. To check your work put down 318 times 12 to prove that you're right. Which would be 318 times 25 = 79.5. If you use a calculator it won't have the decimals ( if you just do the numbers ), but the rest is above.
        
                    
             
        
        
        
Answer:Gary-18 years brother-10 years
Step-by-step explanation:1st case: brother=1 yrs,gary=3 yrs=>after 6 after: brother =7 yrs gary=9 years
2nd case:......
3rd case:.....
4th case:brother:4 years gary:12 yrs=>after 6 yrs:brother=10 yrs gary=18 yrs=>18-10=8