Question

Determine whether (3, 2) and (2, - 1) are solutions to the equation – 3x + y = - 7.

A: both (3,2) and (2,-1) are solutions

B:neither (3,2) nor (2,-1) is a solution

C:(2,-1) is a solution but (3,2) is not

D:(3,2) is a solution but (2,-1) is not

Answer 1

D

Explanation:

plug in (3,2) to see if it's a solution:

A) does -3(3) + 2 equal -7? yes

B) since 'A' is a solution then 'B' cannot be the answer

C) since (3,2) is a solution then 'C' cannot be the answer

plug in (2,-1) to see if it's a solution:

plug in (2,-1) to see if it's a solution:

-3(2) - (-1) equal -7? no, it equals -5

only (3,2) is a solution so the answer is D