audreyburkett12 audreyburkett12

15-02-2017
Mathematics

contestada

7. In which quadrant does the solution of the system fall?
x + y = 4
2x – y = 2

A.I
B.II
C.III
D.IV

Respuesta :

LaceyBunnyHop LaceyBunnyHop

16-02-2017

From X + Y = 4
Y = 4 - X
Substituite this for Y in 2X - Y = 2 to get
2X -(4 - X ) = 2
2X -4 +X = 2
3X = 6
X = 2
Now return to X + Y = 4
Knowing X = 2,
2 + Y = 4
Y = 4 - 2
Y = 2
The solution is (X,Y) = (2,2)
This is quadrant I
Answer is A

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