Which is a solution of the equation?

2x + y = 5

A.
(1, 2)

B.
5

C.
(2, –1)

D.
(3, –1)
@Hero @ganeshie8 @phi @texaschic101

Question

Which is a solution of the equation?
 
    2x + y = 5
 
 A.
(1, 2)
 
 B.
5
 
 C.
(2, –1)
 
 D.
(3, –1)
@Hero @ganeshie8 @phi @texaschic101

anonymous · Answer

D

keeli_grace · Answer

Thank you @Happyhappyhappy

texaschic101 · Answer

do you know how she got the answer ?

texaschic101 · Answer

she just subbed in her points into the equation to see if it satisfies it.
(3,-1)...x = 3 and y = -1
2x + y = 5
2(3) + (-1) = 5
6 - 1 = 5
5 = 5 (correct)

understand ? See how these points satisfy the equation ?

keeli_grace · Answer

Thank you @texaschic101 , I understand now. :)

texaschic101 · Answer

good to hear :)

anonymous · Answer

A line and a point not on the line lie in exactly one plane.