Replace X with the x value in the parenthesis and solve. If the answer equals the Y value inside the parenthesis, it is a solution.
A) (-2, 3), -2(-2) +7 = 4+7 = 11. 11 does not equal 3 so this is not a solution.
B) (-1,9), -2(-1) +7 = 2+7 = 9. 9 equals 9, this is a solution.
c) (3,1), -2(3)+7 = -6+7 = 1, 1 equals 1, this is a solution.
d) (4,-1) = -2(4) +7 = -8 +7 = -1. -1 equals -1, so this is a solution.
The only one that isn't a solution is A.
