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

If someone could explain this to me it would be greatly appreciated. Thank you.

Answer 1

(x,y) is a solution to an eqn when y = mx + c

A. 2(2)-1 = 3 <>-1

B. 2+3 = 5<>-1

C. 2-3 = -1 = y

so C has (2,-1) as a solution