Question

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−7x−2y=14
6x+6y=18
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Answer 1

Answer x=-4, y=7

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

Answer 2

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)