Which order pair is not a solution of y= -4x - 9?
A) -9, 27
B) 3, -21
C) -6, 15
D) 5, -28
To check if an order pair is a solution to the equation, we substitute the values of x and y into the equation and see if it makes a true statement. Let's check each option:
A) y = -4(-9) - 9 = 27, so (x,y) = (-9,27) is a solution.
B) y = -4(3) - 9 = -21, so (x,y) = (3,-21) is a solution.
C) y = -4(-6) - 9 = 15, so (x,y) = (-6,15) is a solution.
D) y = -4(5) - 9 = -29, not -28. Therefore, (x,y) = (5,-28) is not a solution.
Therefore, the answer is D) 5, -28.