Question

Solve x + y = 5 using matrices. 2x – y = 1 I have the answer, x = 2 and y =3, how do I phrase this as a matrices? (2,3)?

Answer 1

x +y = 5

x = 5-y

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2x -y = 1

2•(5-y) -y = 1

10 -2y -y = 1

10 -3y = 1

-3 y = 1-10


-3y = -9

then you can divide it
y = -9/-3

y= 3


for x :

x + y = 5

x + (3) = 5
x= 5-3
x= 2


(x,y)

(2,3)