Question

which equation has (2 -1) as a solution?

A.y=2x - 1...

B.y=x + 3

C.y=x - 3

D.y=(-2x) + 1

Answer 1

( 2 , - 1 )

mean x = 2 , y = - 1

for

A.

y = 2 x - 1

y = 2 ∙ 2 - 1 = 4 - 1 = 3

for

B.

y = x + 3 = 2 + 3 = 5

for

C.

y = x - 3 = 2 - 3 = - 1

for

D.

y = ( - 2 x ) + 1 = ( - 2 ∙ 2 ) + 1 = - 4 + 1 = - 3

Only equation C

y = x - 3

has solution

x = 2 , y = - 1

OR

( 2 , -1)

Answer 2

okay thank you and bless your day