Question

​

−7x−2y=14
6x+6y=18
​

Answer 1

Answer:

Step-by-step explanation:

hello :

−7x−2y=14 ....(*)

6x+6y=18.....(**)

divid (**) by : 6

x+y=3      so : y=3-x    put this value in (*) : -7x-2(3-x) =14

-7x-6+2x=14

-5x=20

x=-4   but   y=3-x      so : y =3-(-4) =7

one solution (-4 ; 7)

Answer 2

Answer:

Answer x=-4, y=7

Step-by-step explanation:

Elimination  

−7x−2y=14  --> (−7x−2y=14 )x3  

-21x-6y=42 (1)

  6x+6y=18 (2)  

-15x     =60

x=60/-15    

x=-4    

plug x=-4 into −7x−2y=14 

-7(-4)-2y=14

28-2y=14Elimination  

−7x−2y=14    (−7x−2y=14 )x3   -21x-6y=42

  6x+6y=18  

-15x     =60

x=60/-15    

x=-4    

plug x=-4 into −7x−2y=14 

                    -7(-4)-2y=14

  28-2y=14

  -2y=14-28

  y= (14-28)/-2

  y=7

Answer x=-4, y=7